220390621 has 16 divisors (see below), whose sum is σ = 250358976. Its totient is φ = 192240000.

The previous prime is 220390613. The next prime is 220390627. The reversal of 220390621 is 126093022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 220390621 - 2³ = 220390613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220390627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23506 + ... + 31516.

It is an arithmetic number, because the mean of its divisors is an integer number (15647436).

Almost surely, 2^220390621 is an apocalyptic number.

It is an amenable number.

220390621 is a deficient number, since it is larger than the sum of its proper divisors (29968355).

220390621 is a wasteful number, since it uses less digits than its factorization.

220390621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8124.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 220390621 is about 14845.5589655627. The cubic root of 220390621 is about 604.0381510703.

The spelling of 220390621 in words is "two hundred twenty million, three hundred ninety thousand, six hundred twenty-one".