697872722421 has 32 divisors (see below), whose sum is σ = 1147224446208. Its totient is φ = 368244864000.

The previous prime is 697872722401. The next prime is 697872722423. The reversal of 697872722421 is 124227278796.

It is not a de Polignac number, because 697872722421 - 2⁵ = 697872722389 is a prime.

It is a super-2 number, since 2×697872722421² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697872722423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18422830 + ... + 18460671.

It is an arithmetic number, because the mean of its divisors is an integer number (35850763944).

Almost surely, 2^697872722421 is an apocalyptic number.

It is an amenable number.

697872722421 is a deficient number, since it is larger than the sum of its proper divisors (449351723787).

697872722421 is a wasteful number, since it uses less digits than its factorization.

697872722421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36883581.

The product of its digits is 9483264, while the sum is 57.

The spelling of 697872722421 in words is "six hundred ninety-seven billion, eight hundred seventy-two million, seven hundred twenty-two thousand, four hundred twenty-one".