220628807621 has 4 divisors (see below), whose sum is σ = 221982358752. Its totient is φ = 219275256492.

The previous prime is 220628807617. The next prime is 220628807657. The reversal of 220628807621 is 126708826022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126708826022 = 2 ⋅63354413011.

It is a cyclic number.

It is not a de Polignac number, because 220628807621 - 2² = 220628807617 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 (220628807521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676775321 + ... + 676775646.

It is an arithmetic number, because the mean of its divisors is an integer number (55495589688).

Almost surely, 2^220628807621 is an apocalyptic number.

It is an amenable number.

220628807621 is a deficient number, since it is larger than the sum of its proper divisors (1353551131).

220628807621 is a wasteful number, since it uses less digits than its factorization.

220628807621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353551130.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 220628807621 in words is "two hundred twenty billion, six hundred twenty-eight million, eight hundred seven thousand, six hundred twenty-one".