21122012012202 has 24 divisors (see below), whose sum is σ = 45764635147140. Its totient is φ = 7040628241920.

The previous prime is 21122012012191. The next prime is 21122012012207. The reversal of 21122012012202 is 20221021022112.

It is a happy number.

21122012012202 is a `hidden beast` number, since 21 + 1 + 220 + 1 + 201 + 220 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21115688422761 + 6323589441 = 4595181^2 + 79521^2 .

It is a super-2 number, since 2×21122012012202² (a number of 27 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21122012012207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390199 + ... + 6511242.

Almost surely, 2^{21122012012202} is an apocalyptic number.

21122012012202 is an abundant number, since it is smaller than the sum of its proper divisors (24642623134938).

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

21122012012202 is a wasteful number, since it uses less digits than its factorization.

21122012012202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071478 (or 7071475 counting only the distinct ones).

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

Adding to 21122012012202 its reverse (20221021022112), we get a palindrome (41343033034314).

The spelling of 21122012012202 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, twelve thousand, two hundred two".