221046209 has 4 divisors (see below), whose sum is σ = 232680240. Its totient is φ = 209412180.

The previous prime is 221046191. The next prime is 221046239. The reversal of 221046209 is 902640122.

221046209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221046209 - 2⁸ = 221045953 is a prime.

It is a super-2 number, since 2×221046209² = 97722853026543362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221046239) 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, 5816987 + ... + 5817024.

It is an arithmetic number, because the mean of its divisors is an integer number (58170060).

Almost surely, 2^221046209 is an apocalyptic number.

It is an amenable number.

221046209 is a deficient number, since it is larger than the sum of its proper divisors (11634031).

221046209 is a wasteful number, since it uses less digits than its factorization.

221046209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11634030.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 221046209 is about 14867.6228429430. The cubic root of 221046209 is about 604.6364949765.

The spelling of 221046209 in words is "two hundred twenty-one million, forty-six thousand, two hundred nine".