21172011496 has 8 divisors (see below), whose sum is σ = 39697521570. Its totient is φ = 10586005744.

The previous prime is 21172011473. The next prime is 21172011533. The reversal of 21172011496 is 69411027112.

It can be written as a sum of positive squares in only one way, i.e., 13715688996 + 7456322500 = 117114^2 + 86350^2 .

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

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 as a sum of consecutive naturals, namely, 1323250711 + ... + 1323250726.

Almost surely, 2^21172011496 is an apocalyptic number.

It is an amenable number.

21172011496 is a deficient number, since it is larger than the sum of its proper divisors (18525510074).

21172011496 is a wasteful number, since it uses less digits than its factorization.

21172011496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646501443 (or 2646501439 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 21172011496 in words is "twenty-one billion, one hundred seventy-two million, eleven thousand, four hundred ninety-six".