21071500083 has 16 divisors (see below), whose sum is σ = 31881231360. Its totient is φ = 13748779368.

The previous prime is 21071500081. The next prime is 21071500097. The reversal of 21071500083 is 38000517012.

21071500083 is a `hidden beast` number, since 2 + 10 + 71 + 500 + 0 + 83 = 666.

It is not a de Polignac number, because 21071500083 - 2¹ = 21071500081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21071500081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8301135 + ... + 8303672.

It is an arithmetic number, because the mean of its divisors is an integer number (1992576960).

Almost surely, 2^21071500083 is an apocalyptic number.

21071500083 is a deficient number, since it is larger than the sum of its proper divisors (10809731277).

21071500083 is a wasteful number, since it uses less digits than its factorization.

21071500083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16604863 (or 16604857 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The spelling of 21071500083 in words is "twenty-one billion, seventy-one million, five hundred thousand, eighty-three".