21100222121202 has 72 divisors (see below), whose sum is σ = 53698447385856. Its totient is φ = 5865698765664.

The previous prime is 21100222121137. The next prime is 21100222121219. The reversal of 21100222121202 is 20212122200112.

It is a happy number.

21100222121202 is a `hidden beast` number, since 21 + 100 + 222 + 121 + 202 = 666.

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 35 ways as a sum of consecutive naturals, for example, 60989698 + ... + 61334685.

It is an arithmetic number, because the mean of its divisors is an integer number (745811769248).

Almost surely, 2^{21100222121202} is an apocalyptic number.

21100222121202 is an abundant number, since it is smaller than the sum of its proper divisors (32598225264654).

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

21100222121202 is a wasteful number, since it uses less digits than its factorization.

21100222121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122324472 (or 122324432 counting only the distinct ones).

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

Adding to 21100222121202 its reverse (20212122200112), we get a palindrome (41312344321314).

The spelling of 21100222121202 in words is "twenty-one trillion, one hundred billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred two".