21332607953 has 2 divisors, whose sum is σ = 21332607954. Its totient is φ = 21332607952.

The previous prime is 21332607949. The next prime is 21332607973. The reversal of 21332607953 is 35970623312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21167922064 + 164685889 = 145492^2 + 12833^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332607953 - 2² = 21332607949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21332607953.

It is not a weakly prime, because it can be changed into another prime (21332607973) 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, 10666303976 + 10666303977.

It is an arithmetic number, because the mean of its divisors is an integer number (10666303977).

Almost surely, 2^21332607953 is an apocalyptic number.

It is an amenable number.

21332607953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332607953 is an equidigital number, since it uses as much as digits as its factorization.

21332607953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 41.

The spelling of 21332607953 in words is "twenty-one billion, three hundred thirty-two million, six hundred seven thousand, nine hundred fifty-three".