222121656 has 64 divisors (see below), whose sum is σ = 633703200. Its totient is φ = 72036864.

The previous prime is 222121589. The next prime is 222121673. The reversal of 222121656 is 656121222.

222121656 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 2 + 1 + 656 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5905 + ... + 21888.

Almost surely, 2^222121656 is an apocalyptic number.

It is an amenable number.

222121656 is an abundant number, since it is smaller than the sum of its proper divisors (411581544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222121656 is a wasteful number, since it uses less digits than its factorization.

222121656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27845 (or 27835 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 222121656 is about 14903.7463746536. The cubic root of 222121656 is about 605.6154800141.

Adding to 222121656 its reverse (656121222), we get a palindrome (878242878).

The spelling of 222121656 in words is "two hundred twenty-two million, one hundred twenty-one thousand, six hundred fifty-six".