721294901919 has 8 divisors (see below), whose sum is σ = 1068585039920. Its totient is φ = 480863267928.

The previous prime is 721294901897. The next prime is 721294901923. The reversal of 721294901919 is 919109492127.

721294901919 is a `hidden beast` number, since 7 + 2 + 129 + 490 + 19 + 19 = 666.

It is not a de Polignac number, because 721294901919 - 2⁷ = 721294901791 is a prime.

It is a super-2 number, since 2×721294901919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721294901219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13357312972 + ... + 13357313025.

It is an arithmetic number, because the mean of its divisors is an integer number (133573129990).

Almost surely, 2^721294901919 is an apocalyptic number.

721294901919 is a deficient number, since it is larger than the sum of its proper divisors (347290138001).

721294901919 is a wasteful number, since it uses less digits than its factorization.

721294901919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26714626006 (or 26714626000 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 721294901919 in words is "seven hundred twenty-one billion, two hundred ninety-four million, nine hundred one thousand, nine hundred nineteen".