221606612 has 12 divisors (see below), whose sum is σ = 388663380. Its totient is φ = 110559936.

The previous prime is 221606573. The next prime is 221606669. The reversal of 221606612 is 216606122.

It can be written as a sum of positive squares in 2 ways, for example, as 156900676 + 64705936 = 12526^2 + 8044^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58787 + ... + 62442.

It is an arithmetic number, because the mean of its divisors is an integer number (32388615).

Almost surely, 2^221606612 is an apocalyptic number.

It is an amenable number.

221606612 is a deficient number, since it is larger than the sum of its proper divisors (167056768).

221606612 is a wasteful number, since it uses less digits than its factorization.

221606612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121690 (or 121688 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 221606612 is about 14886.4573354442. The cubic root of 221606612 is about 605.1470279913.

The spelling of 221606612 in words is "two hundred twenty-one million, six hundred six thousand, six hundred twelve".