21800888452 has 12 divisors (see below), whose sum is σ = 43601776960. Its totient is φ = 9343237896.

The previous prime is 21800888449. The next prime is 21800888489. The reversal of 21800888452 is 25488800812.

21800888452 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389301552 + ... + 389301607.

Almost surely, 2^21800888452 is an apocalyptic number.

It is an amenable number.

21800888452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21800888452 is a wasteful number, since it uses less digits than its factorization.

21800888452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778603170 (or 778603168 counting only the distinct ones).

The product of its (nonzero) digits is 327680, while the sum is 46.

The spelling of 21800888452 in words is "twenty-one billion, eight hundred million, eight hundred eighty-eight thousand, four hundred fifty-two".