221630006621 has 8 divisors (see below), whose sum is σ = 234712575360. Its totient is φ = 208552494528.

The previous prime is 221630006603. The next prime is 221630006659. The reversal of 221630006621 is 126600036122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221630006621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221630005621) 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, 1173731 + ... + 1349408.

It is an arithmetic number, because the mean of its divisors is an integer number (29339071920).

Almost surely, 2^221630006621 is an apocalyptic number.

It is an amenable number.

221630006621 is a deficient number, since it is larger than the sum of its proper divisors (13082568739).

221630006621 is a wasteful number, since it uses less digits than its factorization.

221630006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528323.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 221630006621 in words is "two hundred twenty-one billion, six hundred thirty million, six thousand, six hundred twenty-one".