21252335412 has 96 divisors (see below), whose sum is σ = 62747919360. Its totient is φ = 5437681920.

The previous prime is 21252335389. The next prime is 21252335413. The reversal of 21252335412 is 21453325212.

It is a self number, because there is not a number n which added to its sum of digits gives 21252335412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252335413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109737 + ... + 233552.

It is an arithmetic number, because the mean of its divisors is an integer number (653624160).

Almost surely, 2^21252335412 is an apocalyptic number.

21252335412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21252335412 is an abundant number, since it is smaller than the sum of its proper divisors (41495583948).

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

21252335412 is a wasteful number, since it uses less digits than its factorization.

21252335412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343381 (or 343379 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The spelling of 21252335412 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirty-five thousand, four hundred twelve".