221077189 has 4 divisors (see below), whose sum is σ = 224824320. Its totient is φ = 217330060.

The previous prime is 221077177. The next prime is 221077211. The reversal of 221077189 is 981770122.

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 221077189 - 2¹³ = 221068997 is a prime.

It is a super-2 number, since 2×221077189² = 97750246992283442, 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 (221077139) 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, 1873477 + ... + 1873594.

It is an arithmetic number, because the mean of its divisors is an integer number (56206080).

Almost surely, 2^221077189 is an apocalyptic number.

It is an amenable number.

221077189 is a deficient number, since it is larger than the sum of its proper divisors (3747131).

221077189 is an equidigital number, since it uses as much as digits as its factorization.

221077189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747130.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 221077189 is about 14868.6646676828. The cubic root of 221077189 is about 604.6647405995.

The spelling of 221077189 in words is "two hundred twenty-one million, seventy-seven thousand, one hundred eighty-nine".