221232109 has 12 divisors (see below), whose sum is σ = 257663484. Its totient is φ = 189397824.

The previous prime is 221232103. The next prime is 221232113. The reversal of 221232109 is 901232122.

It can be written as a sum of positive squares in 2 ways, for example, as 54434884 + 166797225 = 7378^2 + 12915^2 .

It is not a de Polignac number, because 221232109 - 2¹³ = 221223917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221232109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221232103) 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, 47409 + ... + 51865.

It is an arithmetic number, because the mean of its divisors is an integer number (21471957).

Almost surely, 2^221232109 is an apocalyptic number.

It is an amenable number.

221232109 is a deficient number, since it is larger than the sum of its proper divisors (36431375).

221232109 is a wasteful number, since it uses less digits than its factorization.

221232109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484 (or 5477 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221232109 is about 14873.8733690993. The cubic root of 221232109 is about 604.8059473724.

The spelling of 221232109 in words is "two hundred twenty-one million, two hundred thirty-two thousand, one hundred nine".