202121022120102 has 80 divisors (see below), whose sum is σ = 463441988021760. Its totient is φ = 65805622909488.

The previous prime is 202121022120077. The next prime is 202121022120137. The reversal of 202121022120102 is 201021220121202.

It is a happy number.

202121022120102 is a `hidden beast` number, since 20 + 212 + 10 + 221 + 201 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 422729623 + ... + 423207485.

It is an arithmetic number, because the mean of its divisors is an integer number (5793024850272).

Almost surely, 2^{202121022120102} is an apocalyptic number.

202121022120102 is an abundant number, since it is smaller than the sum of its proper divisors (261320965901658).

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

202121022120102 is a wasteful number, since it uses less digits than its factorization.

202121022120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538639 (or 538630 counting only the distinct ones).

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

Adding to 202121022120102 its reverse (201021220121202), we get a palindrome (403142242241304).

The spelling of 202121022120102 in words is "two hundred two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty thousand, one hundred two".