21120660623432 has 8 divisors (see below), whose sum is σ = 39601238668950. Its totient is φ = 10560330311712.

The previous prime is 21120660623431. The next prime is 21120660623449. The reversal of 21120660623432 is 23432606602112.

It can be written as a sum of positive squares in only one way, i.e., 13600857188356 + 7519803435076 = 3687934^2 + 2742226^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21120660623431) 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, 1320041288957 + ... + 1320041288972.

Almost surely, 2^{21120660623432} is an apocalyptic number.

It is an amenable number.

21120660623432 is a deficient number, since it is larger than the sum of its proper divisors (18480578045518).

21120660623432 is a wasteful number, since it uses less digits than its factorization.

21120660623432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640082577935 (or 2640082577931 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 21120660623432 in words is "twenty-one trillion, one hundred twenty billion, six hundred sixty million, six hundred twenty-three thousand, four hundred thirty-two".