221608954 has 16 divisors (see below), whose sum is σ = 382324608. Its totient is φ = 94369392.

The previous prime is 221608943. The next prime is 221608997. The reversal of 221608954 is 459806122.

It is a super-2 number, since 2×221608954² = 98221056985948232, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48214 + ... + 52609.

It is an arithmetic number, because the mean of its divisors is an integer number (23895288).

Almost surely, 2^221608954 is an apocalyptic number.

221608954 is a deficient number, since it is larger than the sum of its proper divisors (160715654).

221608954 is a wasteful number, since it uses less digits than its factorization.

221608954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100989.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 221608954 is about 14886.5359973367. The cubic root of 221608954 is about 605.1491597709.

The spelling of 221608954 in words is "two hundred twenty-one million, six hundred eight thousand, nine hundred fifty-four".