21852403400 has 24 divisors (see below), whose sum is σ = 50806838370. Its totient is φ = 8740961280.

The previous prime is 21852403357. The next prime is 21852403403. The reversal of 21852403400 is 430425812.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13487105956 + 8365297444 = 116134^2 + 91462^2 .

It is not an unprimeable number, because it can be changed into a prime (21852403403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54630809 + ... + 54631208.

Almost surely, 2^21852403400 is an apocalyptic number.

21852403400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21852403400 is an abundant number, since it is smaller than the sum of its proper divisors (28954434970).

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

21852403400 is a wasteful number, since it uses less digits than its factorization.

21852403400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109262033 (or 109262024 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 21852403400 in words is "twenty-one billion, eight hundred fifty-two million, four hundred three thousand, four hundred".