202100221120021 has 16 divisors (see below), whose sum is σ = 243306725074560. Its totient is φ = 163990876078080.

The previous prime is 202100221119991. The next prime is 202100221120027. The reversal of 202100221120021 is 120021122001202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 202100221120021 - 2²⁹ = 202099684249109 is a prime.

It is a super-2 number, since 2×202100221120021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202100221119977 and 202100221120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100221120027) 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 15 ways as a sum of consecutive naturals, for example, 558066796 + ... + 558428821.

It is an arithmetic number, because the mean of its divisors is an integer number (15206670317160).

Almost surely, 2^{202100221120021} is an apocalyptic number.

It is an amenable number.

202100221120021 is a deficient number, since it is larger than the sum of its proper divisors (41206503954539).

202100221120021 is a wasteful number, since it uses less digits than its factorization.

202100221120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116497004.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202100221120021 its reverse (120021122001202), we get a palindrome (322121343121223).

The spelling of 202100221120021 in words is "two hundred two trillion, one hundred billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".