621321066 has 24 divisors (see below), whose sum is σ = 1425384324. Its totient is φ = 194924160.

The previous prime is 621321047. The next prime is 621321089. The reversal of 621321066 is 660123126.

621321066 is a `hidden beast` number, since 621 + 32 + 1 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 504227025 + 117094041 = 22455^2 + 10821^2 .

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 1014925 + ... + 1015536.

Almost surely, 2^621321066 is an apocalyptic number.

621321066 is an abundant number, since it is smaller than the sum of its proper divisors (804063258).

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

621321066 is a wasteful number, since it uses less digits than its factorization.

621321066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030486 (or 2030483 counting only the distinct ones).

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

The square root of 621321066 is about 24926.3127237062. The cubic root of 621321066 is about 853.3071006679.

The spelling of 621321066 in words is "six hundred twenty-one million, three hundred twenty-one thousand, sixty-six".