21425399207700 has 72 divisors (see below), whose sum is σ = 62065781098272. Its totient is φ = 5706531089280.

The previous prime is 21425399207669. The next prime is 21425399207731. The reversal of 21425399207700 is 770299352412.

It is an interprime number because it is at equal distance from previous prime (21425399207669) and next prime (21425399207731).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42930859 + ... + 43427058.

It is an arithmetic number, because the mean of its divisors is an integer number (862024737476).

Almost surely, 2^{21425399207700} is an apocalyptic number.

21425399207700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21425399207700 is an abundant number, since it is smaller than the sum of its proper divisors (40640381890572).

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

21425399207700 is a wasteful number, since it uses less digits than its factorization.

21425399207700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86358761 (or 86358754 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 21425399207700 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred ninety-nine million, two hundred seven thousand, seven hundred".