202221001211021 has 12 divisors (see below), whose sum is σ = 231340394788692. Its totient is φ = 175685213718528.

The previous prime is 202221001210999. The next prime is 202221001211027. The reversal of 202221001211021 is 120112100122202.

It can be written as a sum of positive squares in 6 ways, for example, as 32139261722500 + 170081739488521 = 5669150^2 + 13041539^2 .

It is not a de Polignac number, because 202221001211021 - 2²⁶ = 202220934102157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221001211027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26912559620 + ... + 26912567133.

It is an arithmetic number, because the mean of its divisors is an integer number (19278366232391).

Almost surely, 2^{202221001211021} is an apocalyptic number.

It is an amenable number.

202221001211021 is a deficient number, since it is larger than the sum of its proper divisors (29119393577671).

202221001211021 is a wasteful number, since it uses less digits than its factorization.

202221001211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53825126800 (or 53825126783 counting only the distinct ones).

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

Adding to 202221001211021 its reverse (120112100122202), we get a palindrome (322333101333223).

The spelling of 202221001211021 in words is "two hundred two trillion, two hundred twenty-one billion, one million, two hundred eleven thousand, twenty-one".