721522450420 has 48 divisors (see below), whose sum is σ = 1543904167680. Its totient is φ = 283141812096.

The previous prime is 721522450417. The next prime is 721522450423. The reversal of 721522450420 is 24054225127.

It is an interprime number because it is at equal distance from previous prime (721522450417) and next prime (721522450423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721522450423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26845909 + ... + 26872771.

It is an arithmetic number, because the mean of its divisors is an integer number (32164670160).

Almost surely, 2^721522450420 is an apocalyptic number.

It is an amenable number.

721522450420 is an abundant number, since it is smaller than the sum of its proper divisors (822381717260).

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

721522450420 is a wasteful number, since it uses less digits than its factorization.

721522450420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52264 (or 52262 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 34.

Adding to 721522450420 its reverse (24054225127), we get a palindrome (745576675547).

The spelling of 721522450420 in words is "seven hundred twenty-one billion, five hundred twenty-two million, four hundred fifty thousand, four hundred twenty".