21162011575 has 6 divisors (see below), whose sum is σ = 26240894384. Its totient is φ = 16929609240.

The previous prime is 21162011513. The next prime is 21162011581. The reversal of 21162011575 is 57511026112.

It is not a de Polignac number, because 21162011575 - 2⁷ = 21162011447 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 423240207 + ... + 423240256.

Almost surely, 2^21162011575 is an apocalyptic number.

21162011575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21162011575 is a deficient number, since it is larger than the sum of its proper divisors (5078882809).

21162011575 is an equidigital number, since it uses as much as digits as its factorization.

21162011575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846480473 (or 846480468 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 31.

Adding to 21162011575 its reverse (57511026112), we get a palindrome (78673037687).

The spelling of 21162011575 in words is "twenty-one billion, one hundred sixty-two million, eleven thousand, five hundred seventy-five".