221660106 has 32 divisors (see below), whose sum is σ = 459357696. Its totient is φ = 71232000.

The previous prime is 221660077. The next prime is 221660113. The reversal of 221660106 is 601066122.

221660106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50146 + ... + 54386.

It is an arithmetic number, because the mean of its divisors is an integer number (14354928).

Almost surely, 2^221660106 is an apocalyptic number.

221660106 is an abundant number, since it is smaller than the sum of its proper divisors (237697590).

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

221660106 is a wasteful number, since it uses less digits than its factorization.

221660106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 221660106 is about 14888.2539607571. The cubic root of 221660106 is about 605.1957165667.

The spelling of 221660106 in words is "two hundred twenty-one million, six hundred sixty thousand, one hundred six".