21253431435212 has 48 divisors (see below), whose sum is σ = 37643777740800. Its totient is φ = 10498973658240.

The previous prime is 21253431435179. The next prime is 21253431435217. The reversal of 21253431435212 is 21253413435212.

It is a super-2 number, since 2×21253431435212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21253431435217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110539553 + ... + 110731655.

It is an arithmetic number, because the mean of its divisors is an integer number (784245369600).

Almost surely, 2^{21253431435212} is an apocalyptic number.

It is an amenable number.

21253431435212 is a deficient number, since it is larger than the sum of its proper divisors (16390346305588).

21253431435212 is a wasteful number, since it uses less digits than its factorization.

21253431435212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193286 (or 193284 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The spelling of 21253431435212 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred thirty-one million, four hundred thirty-five thousand, two hundred twelve".