21082517032 has 8 divisors (see below), whose sum is σ = 39529719450. Its totient is φ = 10541258512.

The previous prime is 21082516991. The next prime is 21082517033. The reversal of 21082517032 is 23071528012.

It can be written as a sum of positive squares in only one way, i.e., 15024385476 + 6058131556 = 122574^2 + 77834^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21082516985 and 21082517003.

It is not an unprimeable number, because it can be changed into a prime (21082517033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317657307 + ... + 1317657322.

Almost surely, 2^21082517032 is an apocalyptic number.

It is an amenable number.

21082517032 is a deficient number, since it is larger than the sum of its proper divisors (18447202418).

21082517032 is a wasteful number, since it uses less digits than its factorization.

21082517032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635314635 (or 2635314631 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 21082517032 in words is "twenty-one billion, eighty-two million, five hundred seventeen thousand, thirty-two".