721120323 has 32 divisors (see below), whose sum is σ = 1201692672. Its totient is φ = 373687200.

The previous prime is 721120303. The next prime is 721120333. The reversal of 721120323 is 323021127.

It is not a de Polignac number, because 721120323 - 2²⁹ = 184249411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 721120323.

It is not an unprimeable number, because it can be changed into a prime (721120303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95940 + ... + 103182.

It is an arithmetic number, because the mean of its divisors is an integer number (37552896).

Almost surely, 2^721120323 is an apocalyptic number.

721120323 is a deficient number, since it is larger than the sum of its proper divisors (480572349).

721120323 is a wasteful number, since it uses less digits than its factorization.

721120323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7695.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 721120323 is about 26853.6836020685. The cubic root of 721120323 is about 896.7455807024.

The spelling of 721120323 in words is "seven hundred twenty-one million, one hundred twenty thousand, three hundred twenty-three".