621211216 has 20 divisors (see below), whose sum is σ = 1206702900. Its totient is φ = 309804032.

The previous prime is 621211193. The next prime is 621211237. The reversal of 621211216 is 612112126.

It can be written as a sum of positive squares in 2 ways, for example, as 124099600 + 497111616 = 11140^2 + 22296^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 43681 + ... + 56128.

It is an arithmetic number, because the mean of its divisors is an integer number (60335145).

Almost surely, 2^621211216 is an apocalyptic number.

It is an amenable number.

621211216 is a deficient number, since it is larger than the sum of its proper divisors (585491684).

621211216 is a wasteful number, since it uses less digits than its factorization.

621211216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100206 (or 100200 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 621211216 is about 24924.1091315216. The cubic root of 621211216 is about 853.2568092728.

The spelling of 621211216 in words is "six hundred twenty-one million, two hundred eleven thousand, two hundred sixteen".