221948656 has 20 divisors (see below), whose sum is σ = 430366552. Its totient is φ = 110886336.

The previous prime is 221948653. The next prime is 221948659. The reversal of 221948656 is 656849122.

It is an interprime number because it is at equal distance from previous prime (221948653) and next prime (221948659).

It is a super-2 number, since 2×221948656² = 98522411800412672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221948653) 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, 18475 + ... + 28021.

Almost surely, 2^221948656 is an apocalyptic number.

It is an amenable number.

221948656 is a deficient number, since it is larger than the sum of its proper divisors (208417896).

221948656 is a wasteful number, since it uses less digits than its factorization.

221948656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11008 (or 11002 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 221948656 is about 14897.9413342918. The cubic root of 221948656 is about 605.4582108067.

The spelling of 221948656 in words is "two hundred twenty-one million, nine hundred forty-eight thousand, six hundred fifty-six".