221606712 has 32 divisors (see below), whose sum is σ = 615574800. Its totient is φ = 73868832.

The previous prime is 221606699. The next prime is 221606729. The reversal of 221606712 is 217606122.

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 7 ways as a sum of consecutive naturals, for example, 512763 + ... + 513194.

Almost surely, 2^221606712 is an apocalyptic number.

It is an amenable number.

221606712 is an abundant number, since it is smaller than the sum of its proper divisors (393968088).

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

221606712 is a wasteful number, since it uses less digits than its factorization.

221606712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025972 (or 1025962 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 221606712 is about 14886.4606942013. The cubic root of 221606712 is about 605.1471190155.

The spelling of 221606712 in words is "two hundred twenty-one million, six hundred six thousand, seven hundred twelve".