21101331879 has 24 divisors (see below), whose sum is σ = 31323868160. Its totient is φ = 13678435008.

The previous prime is 21101331869. The next prime is 21101331883. The reversal of 21101331879 is 97813310112.

It is not a de Polignac number, because 21101331879 - 2⁹ = 21101331367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101331869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511962 + ... + 551640.

Almost surely, 2^21101331879 is an apocalyptic number.

21101331879 is a deficient number, since it is larger than the sum of its proper divisors (10222536281).

21101331879 is a wasteful number, since it uses less digits than its factorization.

21101331879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41319 (or 41316 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 21101331879 in words is "twenty-one billion, one hundred one million, three hundred thirty-one thousand, eight hundred seventy-nine".