721334871 has 12 divisors (see below), whose sum is σ = 1103218272. Its totient is φ = 452602176.

The previous prime is 721334849. The next prime is 721334879. The reversal of 721334871 is 178433127.

It is not a de Polignac number, because 721334871 - 2⁶ = 721334807 is a prime.

It is a super-2 number, since 2×721334871² = 1040647992241173282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721334879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2357151 + ... + 2357456.

It is an arithmetic number, because the mean of its divisors is an integer number (91934856).

Almost surely, 2^721334871 is an apocalyptic number.

721334871 is a deficient number, since it is larger than the sum of its proper divisors (381883401).

721334871 is a wasteful number, since it uses less digits than its factorization.

721334871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714630 (or 4714627 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 721334871 is about 26857.6780641961. The cubic root of 721334871 is about 896.8345052492.

Adding to 721334871 its reverse (178433127), we get a palindrome (899767998).

The spelling of 721334871 in words is "seven hundred twenty-one million, three hundred thirty-four thousand, eight hundred seventy-one".