921351540722 has 6 divisors (see below), whose sum is σ = 1382029347279. Its totient is φ = 460675091630.

The previous prime is 921351540689. The next prime is 921351540727. The reversal of 921351540722 is 227045153129.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 460675770361 + 460675770361 = 678731^2 + 678731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=678731.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921351540722.

It is not an unprimeable number, because it can be changed into a prime (921351540727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1018097 + ... + 1696827.

Almost surely, 2^921351540722 is an apocalyptic number.

921351540722 is a deficient number, since it is larger than the sum of its proper divisors (460677806557).

921351540722 is an frugal number, since it uses more digits than its factorization.

921351540722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357464 (or 678733 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 921351540722 in words is "nine hundred twenty-one billion, three hundred fifty-one million, five hundred forty thousand, seven hundred twenty-two".