21395851300 has 18 divisors (see below), whose sum is σ = 46428997538. Its totient is φ = 8558340480.

The previous prime is 21395851297. The next prime is 21395851331. The reversal of 21395851300 is 315859312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 48888064 + 21346963236 = 6992^2 + 146106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21395851300.

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, 106979157 + ... + 106979356.

Almost surely, 2^21395851300 is an apocalyptic number.

21395851300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21395851300 is an abundant number, since it is smaller than the sum of its proper divisors (25033146238).

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

21395851300 is a wasteful number, since it uses less digits than its factorization.

21395851300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213958527 (or 213958520 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 21395851300 in words is "twenty-one billion, three hundred ninety-five million, eight hundred fifty-one thousand, three hundred".