621414371820 has 96 divisors (see below), whose sum is σ = 1930310403840. Its totient is φ = 148092578560.

The previous prime is 621414371819. The next prime is 621414371861. The reversal of 621414371820 is 28173414126.

It is a super-2 number, since 2×621414371820² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7940187 + ... + 8018066.

It is an arithmetic number, because the mean of its divisors is an integer number (20107400040).

Almost surely, 2^621414371820 is an apocalyptic number.

621414371820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621414371820 is an abundant number, since it is smaller than the sum of its proper divisors (1308896032020).

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

621414371820 is a wasteful number, since it uses less digits than its factorization.

621414371820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15958335 (or 15958333 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

Adding to 621414371820 its reverse (28173414126), we get a palindrome (649587785946).

The spelling of 621414371820 in words is "six hundred twenty-one billion, four hundred fourteen million, three hundred seventy-one thousand, eight hundred twenty".