221755669 has 4 divisors (see below), whose sum is σ = 233427040. Its totient is φ = 210084300.

The previous prime is 221755637. The next prime is 221755691. The reversal of 221755669 is 966557122.

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 221755669 - 2⁵ = 221755637 is a prime.

It is a super-2 number, since 2×221755669² = 98351153467275122, 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 (221755169) 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, 5835657 + ... + 5835694.

It is an arithmetic number, because the mean of its divisors is an integer number (58356760).

Almost surely, 2^221755669 is an apocalyptic number.

It is an amenable number.

221755669 is a deficient number, since it is larger than the sum of its proper divisors (11671371).

221755669 is a wasteful number, since it uses less digits than its factorization.

221755669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671370.

The product of its digits is 226800, while the sum is 43.

The square root of 221755669 is about 14891.4629570100. The cubic root of 221755669 is about 605.2826755449.

The spelling of 221755669 in words is "two hundred twenty-one million, seven hundred fifty-five thousand, six hundred sixty-nine".