20921161912 has 48 divisors (see below), whose sum is σ = 46492635960. Its totient is φ = 8797029696.

The previous prime is 20921161879. The next prime is 20921161999. The reversal of 20921161912 is 21916112902.

It is a super-3 number, since 3×20921161912³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 482718 + ... + 524269.

Almost surely, 2^20921161912 is an apocalyptic number.

It is an amenable number.

20921161912 is an abundant number, since it is smaller than the sum of its proper divisors (25571474048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20921161912 is a wasteful number, since it uses less digits than its factorization.

20921161912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007060 (or 1007049 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 20921161912 in words is "twenty billion, nine hundred twenty-one million, one hundred sixty-one thousand, nine hundred twelve".