21253006852 has 48 divisors (see below), whose sum is σ = 48810746880. Its totient is φ = 7844580000.

The previous prime is 21253006849. The next prime is 21253006927. The reversal of 21253006852 is 25860035212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1810024 + ... + 1821727.

It is an arithmetic number, because the mean of its divisors is an integer number (1016890560).

Almost surely, 2^21253006852 is an apocalyptic number.

21253006852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21253006852 is an abundant number, since it is smaller than the sum of its proper divisors (27557740028).

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

21253006852 is a wasteful number, since it uses less digits than its factorization.

21253006852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631792 (or 3631790 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 21253006852 in words is "twenty-one billion, two hundred fifty-three million, six thousand, eight hundred fifty-two".