221307612 has 24 divisors (see below), whose sum is σ = 516700800. Its totient is φ = 73724016.

The previous prime is 221307571. The next prime is 221307617. The reversal of 221307612 is 216703122.

221307612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221307617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19089 + ... + 28407.

It is an arithmetic number, because the mean of its divisors is an integer number (21529200).

Almost surely, 2^221307612 is an apocalyptic number.

It is an amenable number.

221307612 is an abundant number, since it is smaller than the sum of its proper divisors (295393188).

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

221307612 is a wasteful number, since it uses less digits than its factorization.

221307612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11305 (or 11303 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 221307612 is about 14876.4112607846. The cubic root of 221307612 is about 604.8747430967.

The spelling of 221307612 in words is "two hundred twenty-one million, three hundred seven thousand, six hundred twelve".