21203570808 has 96 divisors (see below), whose sum is σ = 65650572000. Its totient is φ = 6056273664.

The previous prime is 21203570767. The next prime is 21203570821. The reversal of 21203570808 is 80807530212.

21203570808 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 3 + 570 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2805018 + ... + 2812566.

It is an arithmetic number, because the mean of its divisors is an integer number (683860125).

Almost surely, 2^21203570808 is an apocalyptic number.

21203570808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21203570808 is an abundant number, since it is smaller than the sum of its proper divisors (44447001192).

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

21203570808 is a wasteful number, since it uses less digits than its factorization.

21203570808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13141 (or 13134 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21203570808 in words is "twenty-one billion, two hundred three million, five hundred seventy thousand, eight hundred eight".