721222402 has 32 divisors (see below), whose sum is σ = 1161578880. Its totient is φ = 335207040.

The previous prime is 721222393. The next prime is 721222421. The reversal of 721222402 is 204222127.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 175038 + ... + 179110.

It is an arithmetic number, because the mean of its divisors is an integer number (36299340).

Almost surely, 2^721222402 is an apocalyptic number.

721222402 is a deficient number, since it is larger than the sum of its proper divisors (440356478).

721222402 is a wasteful number, since it uses less digits than its factorization.

721222402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 721222402 is about 26855.5841865337. The cubic root of 721222402 is about 896.7878919831.

Adding to 721222402 its reverse (204222127), we get a palindrome (925444529).

The spelling of 721222402 in words is "seven hundred twenty-one million, two hundred twenty-two thousand, four hundred two".