202221210021021 has 16 divisors (see below), whose sum is σ = 299587566097920. Its totient is φ = 134813875284000.

The previous prime is 202221210021011. The next prime is 202221210021029. The reversal of 202221210021021 is 120120012122202.

It is a happy number.

202221210021021 is a `hidden beast` number, since 2 + 0 + 2 + 221 + 210 + 0 + 210 + 21 = 666.

It is not a de Polignac number, because 202221210021021 - 2¹⁴ = 202221210004637 is a prime.

It is a super-2 number, since 2×202221210021021² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202221210020985 and 202221210021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221210021029) 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, 7172521 + ... + 21351521.

It is an arithmetic number, because the mean of its divisors is an integer number (18724222881120).

Almost surely, 2^{202221210021021} is an apocalyptic number.

It is an amenable number.

202221210021021 is a deficient number, since it is larger than the sum of its proper divisors (97366356076899).

202221210021021 is a wasteful number, since it uses less digits than its factorization.

202221210021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14707233 (or 14707227 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 202221210021021 its reverse (120120012122202), we get a palindrome (322341222143223).

The spelling of 202221210021021 in words is "two hundred two trillion, two hundred twenty-one billion, two hundred ten million, twenty-one thousand, twenty-one".