621221144 has 16 divisors (see below), whose sum is σ = 1166220720. Its totient is φ = 310228960.

The previous prime is 621221101. The next prime is 621221147. The reversal of 621221144 is 441122126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621221147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40724 + ... + 53859.

It is an arithmetic number, because the mean of its divisors is an integer number (72888795).

Almost surely, 2^621221144 is an apocalyptic number.

It is an amenable number.

621221144 is a deficient number, since it is larger than the sum of its proper divisors (544999576).

621221144 is a wasteful number, since it uses less digits than its factorization.

621221144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95410 (or 95406 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 621221144 is about 24924.3082953168. The cubic root of 621221144 is about 853.2613547415.

The spelling of 621221144 in words is "six hundred twenty-one million, two hundred twenty-one thousand, one hundred forty-four".