721422356319 has 144 divisors (see below), whose sum is σ = 1296145344000. Its totient is φ = 385473108384.

The previous prime is 721422356293. The next prime is 721422356321. The reversal of 721422356319 is 913653224127.

It is a happy number.

721422356319 is a `hidden beast` number, since 7 + 2 + 1 + 4 + 2 + 2 + 3 + 5 + 631 + 9 = 666.

It is not a de Polignac number, because 721422356319 - 2⁷ = 721422356191 is a prime.

It is a super-2 number, since 2×721422356319² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721422356359) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 238959192 + ... + 238962210.

Almost surely, 2^721422356319 is an apocalyptic number.

721422356319 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

721422356319 is a deficient number, since it is larger than the sum of its proper divisors (574722987681).

721422356319 is a wasteful number, since it uses less digits than its factorization.

721422356319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175 (or 3127 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 721422356319 in words is "seven hundred twenty-one billion, four hundred twenty-two million, three hundred fifty-six thousand, three hundred nineteen".