221612428 has 24 divisors (see below), whose sum is σ = 421406720. Its totient is φ = 101586960.

The previous prime is 221612401. The next prime is 221612441. The reversal of 221612428 is 824216122.

It is a super-2 number, since 2×221612428² = 98224136488110368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221612396 and 221612405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44676 + ... + 49387.

Almost surely, 2^221612428 is an apocalyptic number.

It is an amenable number.

221612428 is a deficient number, since it is larger than the sum of its proper divisors (199794292).

221612428 is a wasteful number, since it uses less digits than its factorization.

221612428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94117 (or 94115 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 221612428 is about 14886.6526794978. The cubic root of 221612428 is about 605.1523219133.

The spelling of 221612428 in words is "two hundred twenty-one million, six hundred twelve thousand, four hundred twenty-eight".