21202012121202 has 24 divisors (see below), whose sum is σ = 50113846832400. Its totient is φ = 6424852157880.

The previous prime is 21202012121177. The next prime is 21202012121231. The reversal of 21202012121202 is 20212121020212.

It is a happy number.

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

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, 53540434452 + ... + 53540434847.

It is an arithmetic number, because the mean of its divisors is an integer number (2088076951350).

Almost surely, 2^{21202012121202} is an apocalyptic number.

21202012121202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21202012121202 is an abundant number, since it is smaller than the sum of its proper divisors (28911834711198).

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

21202012121202 is a wasteful number, since it uses less digits than its factorization.

21202012121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107080869318 (or 107080869315 counting only the distinct ones).

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

Adding to 21202012121202 its reverse (20212121020212), we get a palindrome (41414133141414).

The spelling of 21202012121202 in words is "twenty-one trillion, two hundred two billion, twelve million, one hundred twenty-one thousand, two hundred two".