113818221 has 12 divisors (see below), whose sum is σ = 179350080. Its totient is φ = 68980680.

The previous prime is 113818217. The next prime is 113818261. The reversal of 113818221 is 122818311.

It is not a de Polignac number, because 113818221 - 2² = 113818217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113818261) 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, 574741 + ... + 574938.

It is an arithmetic number, because the mean of its divisors is an integer number (14945840).

Almost surely, 2^113818221 is an apocalyptic number.

113818221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

113818221 is a deficient number, since it is larger than the sum of its proper divisors (65531859).

113818221 is a wasteful number, since it uses less digits than its factorization.

113818221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149696 (or 1149693 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 113818221 is about 10668.5622742711. The cubic root of 113818221 is about 484.6228988485.

The spelling of 113818221 in words is "one hundred thirteen million, eight hundred eighteen thousand, two hundred twenty-one".