202121212122100 has 36 divisors (see below), whose sum is σ = 444611291010124. Its totient is φ = 79740971354880.

The previous prime is 202121212122097. The next prime is 202121212122143. The reversal of 202121212122100 is 1221212121202.

202121212122100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 16775151679504 + 185346060442596 = 4095748^2 + 13614186^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13843911339 + ... + 13843925938.

Almost surely, 2^{202121212122100} is an apocalyptic number.

202121212122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121212122100 is an abundant number, since it is smaller than the sum of its proper divisors (242490078888024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202121212122100 is a wasteful number, since it uses less digits than its factorization.

202121212122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27687837364 (or 27687837357 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202121212122100 its reverse (1221212121202), we get a palindrome (203342424243302).

The spelling of 202121212122100 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, one hundred".