221707612 has 12 divisors (see below), whose sum is σ = 443415280. Its totient is φ = 95017536.

The previous prime is 221707597. The next prime is 221707627. The reversal of 221707612 is 216707122.

It is an interprime number because it is at equal distance from previous prime (221707597) and next prime (221707627).

221707612 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 7918129 = 221707612 / (2 + 2 + 1 + 7 + 0 + 7 + 6 + 1 + 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, 3959037 + ... + 3959092.

Almost surely, 2^221707612 is an apocalyptic number.

It is an amenable number.

221707612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221707612 is a wasteful number, since it uses less digits than its factorization.

221707612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918140 (or 7918138 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 221707612 is about 14889.8492940661. The cubic root of 221707612 is about 605.2389484839.

The spelling of 221707612 in words is "two hundred twenty-one million, seven hundred seven thousand, six hundred twelve".