221046109 has 4 divisors (see below), whose sum is σ = 222454204. Its totient is φ = 219638016.

The previous prime is 221046107. The next prime is 221046113. The reversal of 221046109 is 901640122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40896025 + 180150084 = 6395^2 + 13422^2 .

It is a cyclic number.

It is not a de Polignac number, because 221046109 - 2¹ = 221046107 is a prime.

It is a super-2 number, since 2×221046109² = 97722764608079762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221046107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703812 + ... + 704125.

It is an arithmetic number, because the mean of its divisors is an integer number (55613551).

Almost surely, 2^221046109 is an apocalyptic number.

It is an amenable number.

221046109 is a deficient number, since it is larger than the sum of its proper divisors (1408095).

221046109 is a wasteful number, since it uses less digits than its factorization.

221046109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408094.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 221046109 is about 14867.6194799302. The cubic root of 221046109 is about 604.6364037985.

The spelling of 221046109 in words is "two hundred twenty-one million, forty-six thousand, one hundred nine".