201010021220021 has 4 divisors (see below), whose sum is σ = 216472330544652. Its totient is φ = 185547711895392.

The previous prime is 201010021220011. The next prime is 201010021220051. The reversal of 201010021220021 is 120022120010102.

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 83479487897521 + 117530533322500 = 9136711^2 + 10841150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201010021220021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201010021219978 and 201010021220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201010021220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731154662296 + ... + 7731154662321.

It is an arithmetic number, because the mean of its divisors is an integer number (54118082636163).

Almost surely, 2^{201010021220021} is an apocalyptic number.

It is an amenable number.

201010021220021 is a deficient number, since it is larger than the sum of its proper divisors (15462309324631).

201010021220021 is a wasteful number, since it uses less digits than its factorization.

201010021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15462309324630.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201010021220021 its reverse (120022120010102), we get a palindrome (321032141230123).

The spelling of 201010021220021 in words is "two hundred one trillion, ten billion, twenty-one million, two hundred twenty thousand, twenty-one".