201002021020021 has 4 divisors (see below), whose sum is σ = 216463714944652. Its totient is φ = 185540327095392.

The previous prime is 201002021020007. The next prime is 201002021020033. The reversal of 201002021020021 is 120020120200102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122621294902500 + 78380726117521 = 11073450^2 + 8853289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201002021020021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15461693924617 = 201002021020021 / (2 + 0 + 1 + 0 + 0 + 2 + 0 + 2 + 1 + 0 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201002021019983 and 201002021020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201002021020721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730846962296 + ... + 7730846962321.

It is an arithmetic number, because the mean of its divisors is an integer number (54115928736163).

Almost surely, 2^{201002021020021} is an apocalyptic number.

It is an amenable number.

201002021020021 is a deficient number, since it is larger than the sum of its proper divisors (15461693924631).

201002021020021 is a wasteful number, since it uses less digits than its factorization.

201002021020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15461693924630.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201002021020021 its reverse (120020120200102), we get a palindrome (321022141220123).

The spelling of 201002021020021 in words is "two hundred one trillion, two billion, twenty-one million, twenty thousand, twenty-one".