21162506908 has 24 divisors (see below), whose sum is σ = 38716100640. Its totient is φ = 10102466880.

The previous prime is 21162506891. The next prime is 21162506909. The reversal of 21162506908 is 80960526112.

It is a super-3 number, since 3×21162506908³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162506909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162823 + ... + 262366.

It is an arithmetic number, because the mean of its divisors is an integer number (1613170860).

Almost surely, 2^21162506908 is an apocalyptic number.

It is an amenable number.

21162506908 is a deficient number, since it is larger than the sum of its proper divisors (17553593732).

21162506908 is a wasteful number, since it uses less digits than its factorization.

21162506908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425757 (or 425755 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 21162506908 in words is "twenty-one billion, one hundred sixty-two million, five hundred six thousand, nine hundred eight".