621630312120 has 192 divisors, whose sum is σ = 2051263019520. Its totient is φ = 163229375232.

The previous prime is 621630312119. The next prime is 621630312137. The reversal of 621630312120 is 21213036126.

621630312120 is a `hidden beast` number, since 6 + 2 + 1 + 630 + 3 + 1 + 2 + 1 + 20 = 666.

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 47 ways as a sum of consecutive naturals, for example, 112468797 + ... + 112474323.

It is an arithmetic number, because the mean of its divisors is an integer number (10683661560).

Almost surely, 2^621630312120 is an apocalyptic number.

621630312120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621630312120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025631509760).

621630312120 is an abundant number, since it is smaller than the sum of its proper divisors (1429632707400).

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

621630312120 is a wasteful number, since it uses less digits than its factorization.

621630312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10274 (or 10267 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 621630312120 its reverse (21213036126), we get a palindrome (642843348246).

The spelling of 621630312120 in words is "six hundred twenty-one billion, six hundred thirty million, three hundred twelve thousand, one hundred twenty".