220457621 has 8 divisors (see below), whose sum is σ = 221811744. Its totient is φ = 219108240.

The previous prime is 220457609. The next prime is 220457639. The reversal of 220457621 is 126754022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220457621 - 2²² = 216263317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220457651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135191 + ... + 136811.

It is an arithmetic number, because the mean of its divisors is an integer number (27726468).

Almost surely, 2^220457621 is an apocalyptic number.

It is an amenable number.

220457621 is a deficient number, since it is larger than the sum of its proper divisors (1354123).

220457621 is a wasteful number, since it uses less digits than its factorization.

220457621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 220457621 is about 14847.8153611903. The cubic root of 220457621 is about 604.0993552110.

The spelling of 220457621 in words is "two hundred twenty million, four hundred fifty-seven thousand, six hundred twenty-one".