202100212221021 has 16 divisors (see below), whose sum is σ = 302205924820800. Its totient is φ = 133474283458704.

The previous prime is 202100212221013. The next prime is 202100212221101. The reversal of 202100212221021 is 120122212001202.

It is a happy number.

202100212221021 is a `hidden beast` number, since 2 + 0 + 210 + 0 + 212 + 221 + 0 + 21 = 666.

It is not a de Polignac number, because 202100212221021 - 2³ = 202100212221013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202100212220985 and 202100212221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100212221421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34977534706 + ... + 34977540483.

It is an arithmetic number, because the mean of its divisors is an integer number (18887870301300).

Almost surely, 2^{202100212221021} is an apocalyptic number.

It is an amenable number.

202100212221021 is a deficient number, since it is larger than the sum of its proper divisors (100105712599779).

202100212221021 is a wasteful number, since it uses less digits than its factorization.

202100212221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69955075305 (or 69955075299 counting only the distinct ones).

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

Adding to 202100212221021 its reverse (120122212001202), we get a palindrome (322222424222223).

The spelling of 202100212221021 in words is "two hundred two trillion, one hundred billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".