221408612 has 24 divisors (see below), whose sum is σ = 412546680. Its totient is φ = 103610880.

The previous prime is 221408609. The next prime is 221408633. The reversal of 221408612 is 216804122.

It is a happy number.

221408612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 25240576 + 196168036 = 5024^2 + 14006^2 .

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, 3314 + ... + 21302.

It is an arithmetic number, because the mean of its divisors is an integer number (17189445).

Almost surely, 2^221408612 is an apocalyptic number.

It is an amenable number.

221408612 is a deficient number, since it is larger than the sum of its proper divisors (191138068).

221408612 is a wasteful number, since it uses less digits than its factorization.

221408612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18191 (or 18189 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 221408612 is about 14879.8055094816. The cubic root of 221408612 is about 604.9667463452.

The spelling of 221408612 in words is "two hundred twenty-one million, four hundred eight thousand, six hundred twelve".