21123031883 has 2 divisors, whose sum is σ = 21123031884. Its totient is φ = 21123031882.

The previous prime is 21123031877. The next prime is 21123031903. The reversal of 21123031883 is 38813032112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123031883 - 2⁶ = 21123031819 is a prime.

It is not a weakly prime, because it can be changed into another prime (21123031843) 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 as a sum of consecutive naturals, namely, 10561515941 + 10561515942.

It is an arithmetic number, because the mean of its divisors is an integer number (10561515942).

Almost surely, 2^21123031883 is an apocalyptic number.

21123031883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123031883 is an equidigital number, since it uses as much as digits as its factorization.

21123031883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 21123031883 its reverse (38813032112), we get a palindrome (59936063995).

The spelling of 21123031883 in words is "twenty-one billion, one hundred twenty-three million, thirty-one thousand, eight hundred eighty-three".