10902320721 has 6 divisors (see below), whose sum is σ = 15747796610. Its totient is φ = 7268213808.

The previous prime is 10902320717. The next prime is 10902320747. The reversal of 10902320721 is 12702320901.

It can be written as a sum of positive squares in only one way, i.e., 8358530625 + 2543790096 = 91425^2 + 50436^2 .

It is not a de Polignac number, because 10902320721 - 2² = 10902320717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10902320771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 605684476 + ... + 605684493.

Almost surely, 2^10902320721 is an apocalyptic number.

It is an amenable number.

10902320721 is a deficient number, since it is larger than the sum of its proper divisors (4845475889).

10902320721 is a wasteful number, since it uses less digits than its factorization.

10902320721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211368975 (or 1211368972 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The spelling of 10902320721 in words is "ten billion, nine hundred two million, three hundred twenty thousand, seven hundred twenty-one".