21316832923 has 2 divisors, whose sum is σ = 21316832924. Its totient is φ = 21316832922.

The previous prime is 21316832869. The next prime is 21316832941. The reversal of 21316832923 is 32923861312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21316832923 - 2¹³ = 21316824731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21316832983) 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, 10658416461 + 10658416462.

It is an arithmetic number, because the mean of its divisors is an integer number (10658416462).

Almost surely, 2^21316832923 is an apocalyptic number.

21316832923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21316832923 is an equidigital number, since it uses as much as digits as its factorization.

21316832923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The spelling of 21316832923 in words is "twenty-one billion, three hundred sixteen million, eight hundred thirty-two thousand, nine hundred twenty-three".