201012221021021 has 4 divisors (see below), whose sum is σ = 201015180066492. Its totient is φ = 201009261975552.

The previous prime is 201012221020999. The next prime is 201012221021039. The reversal of 201012221021021 is 120120122210102.

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 98723877408121 + 102288343612900 = 9935989^2 + 10113770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201012221021021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201012221029021) 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, 1479420836 + ... + 1479556701.

It is an arithmetic number, because the mean of its divisors is an integer number (50253795016623).

Almost surely, 2^{201012221021021} is an apocalyptic number.

It is an amenable number.

201012221021021 is a deficient number, since it is larger than the sum of its proper divisors (2959045471).

201012221021021 is an equidigital number, since it uses as much as digits as its factorization.

201012221021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959045470.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201012221021021 its reverse (120120122210102), we get a palindrome (321132343231123).

The spelling of 201012221021021 in words is "two hundred one trillion, twelve billion, two hundred twenty-one million, twenty-one thousand, twenty-one".