221099121 has 12 divisors (see below), whose sum is σ = 320112000. Its totient is φ = 147054840.

The previous prime is 221099119. The next prime is 221099147. The reversal of 221099121 is 121990122.

It is not a de Polignac number, because 221099121 - 2¹ = 221099119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221099111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24621 + ... + 32378.

It is an arithmetic number, because the mean of its divisors is an integer number (26676000).

Almost surely, 2^221099121 is an apocalyptic number.

It is an amenable number.

221099121 is a deficient number, since it is larger than the sum of its proper divisors (99012879).

221099121 is a wasteful number, since it uses less digits than its factorization.

221099121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57436 (or 57433 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 221099121 is about 14869.4021735912. The cubic root of 221099121 is about 604.6847352276.

The spelling of 221099121 in words is "two hundred twenty-one million, ninety-nine thousand, one hundred twenty-one".