253721306620 has 48 divisors (see below), whose sum is σ = 561128117760. Its totient is φ = 96100651584.

The previous prime is 253721306569. The next prime is 253721306653. The reversal of 253721306620 is 26603127352.

It is a self number, because there is not a number n which added to its sum of digits gives 253721306620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633097 + ... + 953023.

It is an arithmetic number, because the mean of its divisors is an integer number (11690169120).

Almost surely, 2^253721306620 is an apocalyptic number.

253721306620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253721306620 is an abundant number, since it is smaller than the sum of its proper divisors (307406811140).

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

253721306620 is a wasteful number, since it uses less digits than its factorization.

253721306620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322042 (or 322040 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 253721306620 in words is "two hundred fifty-three billion, seven hundred twenty-one million, three hundred six thousand, six hundred twenty".