21253425400 has 24 divisors (see below), whose sum is σ = 49414214520. Its totient is φ = 8501370080.

The previous prime is 21253425343. The next prime is 21253425421. The reversal of 21253425400 is 452435212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53133364 + ... + 53133763.

It is an arithmetic number, because the mean of its divisors is an integer number (2058925605).

Almost surely, 2^21253425400 is an apocalyptic number.

21253425400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253425400 is an abundant number, since it is smaller than the sum of its proper divisors (28160789120).

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

21253425400 is a wasteful number, since it uses less digits than its factorization.

21253425400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106267143 (or 106267134 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The spelling of 21253425400 in words is "twenty-one billion, two hundred fifty-three million, four hundred twenty-five thousand, four hundred".