21131995883 has 4 divisors (see below), whose sum is σ = 21191860248. Its totient is φ = 21072131520.

The previous prime is 21131995879. The next prime is 21131995903. The reversal of 21131995883 is 38859913112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21131995883 - 2² = 21131995879 is a prime.

It is a super-2 number, since 2×21131995883² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131995823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29931653 + ... + 29932358.

It is an arithmetic number, because the mean of its divisors is an integer number (5297965062).

Almost surely, 2^21131995883 is an apocalyptic number.

21131995883 is a deficient number, since it is larger than the sum of its proper divisors (59864365).

21131995883 is an equidigital number, since it uses as much as digits as its factorization.

21131995883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59864364.

The product of its digits is 466560, while the sum is 50.

The spelling of 21131995883 in words is "twenty-one billion, one hundred thirty-one million, nine hundred ninety-five thousand, eight hundred eighty-three".