21820909113 has 32 divisors (see below), whose sum is σ = 34238949120. Its totient is φ = 13687522560.

The previous prime is 21820909093. The next prime is 21820909153. The reversal of 21820909113 is 31190902812.

It is not a de Polignac number, because 21820909113 - 2²⁰ = 21819860537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21820909153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2667756 + ... + 2675922.

It is an arithmetic number, because the mean of its divisors is an integer number (1069967160).

Almost surely, 2^21820909113 is an apocalyptic number.

It is an amenable number.

21820909113 is a deficient number, since it is larger than the sum of its proper divisors (12418040007).

21820909113 is a wasteful number, since it uses less digits than its factorization.

21820909113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14014 (or 14008 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 21820909113 in words is "twenty-one billion, eight hundred twenty million, nine hundred nine thousand, one hundred thirteen".