21322210031987 has 2 divisors, whose sum is σ = 21322210031988. Its totient is φ = 21322210031986.

The previous prime is 21322210031981. The next prime is 21322210032029. The reversal of 21322210031987 is 78913001222312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21322210031987 - 2⁶ = 21322210031923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322210031981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661105015993 + 10661105015994.

It is an arithmetic number, because the mean of its divisors is an integer number (10661105015994).

Almost surely, 2^{21322210031987} is an apocalyptic number.

21322210031987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322210031987 is an equidigital number, since it uses as much as digits as its factorization.

21322210031987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21322210031987 in words is "twenty-one trillion, three hundred twenty-two billion, two hundred ten million, thirty-one thousand, nine hundred eighty-seven".