621522817412 has 24 divisors (see below), whose sum is σ = 1254046045056. Its totient is φ = 264009691008.

The previous prime is 621522817373. The next prime is 621522817417. The reversal of 621522817412 is 214718225126.

It is a super-2 number, since 2×621522817412² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621522817412.

It is not an unprimeable number, because it can be changed into a prime (621522817417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98214728 + ... + 98221055.

It is an arithmetic number, because the mean of its divisors is an integer number (52251918544).

Almost surely, 2^621522817412 is an apocalyptic number.

It is an amenable number.

621522817412 is an abundant number, since it is smaller than the sum of its proper divisors (632523227644).

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

621522817412 is a wasteful number, since it uses less digits than its factorization.

621522817412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196435907 (or 196435905 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 621522817412 in words is "six hundred twenty-one billion, five hundred twenty-two million, eight hundred seventeen thousand, four hundred twelve".