220943721 has 8 divisors (see below), whose sum is σ = 304750080. Its totient is φ = 142216592.

The previous prime is 220943699. The next prime is 220943743. The reversal of 220943721 is 127349022.

It is an interprime number because it is at equal distance from previous prime (220943699) and next prime (220943743).

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 220943721 - 2⁹ = 220943209 is a prime.

It is a super-2 number, since 2×220943721² = 97632255698651682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220943791) 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, 1269705 + ... + 1269878.

It is an arithmetic number, because the mean of its divisors is an integer number (38093760).

Almost surely, 2^220943721 is an apocalyptic number.

It is an amenable number.

220943721 is a deficient number, since it is larger than the sum of its proper divisors (83806359).

220943721 is a wasteful number, since it uses less digits than its factorization.

220943721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539615.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 220943721 is about 14864.1757591869. The cubic root of 220943721 is about 604.5430340286.

The spelling of 220943721 in words is "two hundred twenty million, nine hundred forty-three thousand, seven hundred twenty-one".