21124631883 has 4 divisors (see below), whose sum is σ = 28166175848. Its totient is φ = 14083087920.

The previous prime is 21124631881. The next prime is 21124631903. The reversal of 21124631883 is 38813642112.

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

It is not a de Polignac number, because 21124631883 - 2¹ = 21124631881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124631881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520771978 + ... + 3520771983.

It is an arithmetic number, because the mean of its divisors is an integer number (7041543962).

Almost surely, 2^21124631883 is an apocalyptic number.

21124631883 is a deficient number, since it is larger than the sum of its proper divisors (7041543965).

21124631883 is an equidigital number, since it uses as much as digits as its factorization.

21124631883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041543964.

The product of its digits is 55296, while the sum is 39.

The spelling of 21124631883 in words is "twenty-one billion, one hundred twenty-four million, six hundred thirty-one thousand, eight hundred eighty-three".