21097140928 has 28 divisors (see below), whose sum is σ = 41872113360. Its totient is φ = 10546687232.

The previous prime is 21097140907. The next prime is 21097140929. The reversal of 21097140928 is 82904179012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21097140929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374925 + ... + 427507.

It is an arithmetic number, because the mean of its divisors is an integer number (1495432620).

Almost surely, 2^21097140928 is an apocalyptic number.

It is an amenable number.

21097140928 is a deficient number, since it is larger than the sum of its proper divisors (20774972432).

21097140928 is an equidigital number, since it uses as much as digits as its factorization.

21097140928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58864 (or 58854 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 21097140928 in words is "twenty-one billion, ninety-seven million, one hundred forty thousand, nine hundred twenty-eight".