621216126 has 24 divisors (see below), whose sum is σ = 1348261200. Its totient is φ = 206719296.

The previous prime is 621216121. The next prime is 621216139. The reversal of 621216126 is 621612126.

621216126 is a `hidden beast` number, since 6 + 21 + 21 + 612 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 621216126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621216121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18426 + ... + 39773.

It is an arithmetic number, because the mean of its divisors is an integer number (56177550).

Almost surely, 2^621216126 is an apocalyptic number.

621216126 is an abundant number, since it is smaller than the sum of its proper divisors (727045074).

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

621216126 is a wasteful number, since it uses less digits than its factorization.

621216126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58800 (or 58797 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 621216126 is about 24924.2076303340. The cubic root of 621216126 is about 853.2590572896.

The spelling of 621216126 in words is "six hundred twenty-one million, two hundred sixteen thousand, one hundred twenty-six".