721242104 has 32 divisors (see below), whose sum is σ = 1478183040. Its totient is φ = 327189600.

The previous prime is 721242097. The next prime is 721242121. The reversal of 721242104 is 401242127.

It is a self number, because there is not a number n which added to its sum of digits gives 721242104.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38189 + ... + 53859.

It is an arithmetic number, because the mean of its divisors is an integer number (46193220).

Almost surely, 2^721242104 is an apocalyptic number.

It is an amenable number.

721242104 is an abundant number, since it is smaller than the sum of its proper divisors (756940936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721242104 is a wasteful number, since it uses less digits than its factorization.

721242104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16211 (or 16207 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 721242104 is about 26855.9509978701. The cubic root of 721242104 is about 896.7960579128.

Adding to 721242104 its sum of digits (23), we get a palindrome (721242127).

The spelling of 721242104 in words is "seven hundred twenty-one million, two hundred forty-two thousand, one hundred four".