221677231 has 2 divisors, whose sum is σ = 221677232. Its totient is φ = 221677230.

The previous prime is 221677213. The next prime is 221677259. The reversal of 221677231 is 132776122.

Together with previous prime (221677213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221677231 - 2²⁷ = 87459503 is a prime.

It is a super-2 number, since 2×221677231² = 98281589487654722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221677193 and 221677202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221677271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110838615 + 110838616.

It is an arithmetic number, because the mean of its divisors is an integer number (110838616).

Almost surely, 2^221677231 is an apocalyptic number.

221677231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221677231 is an equidigital number, since it uses as much as digits as its factorization.

221677231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 221677231 is about 14888.8290674586. The cubic root of 221677231 is about 605.2113015539.

The spelling of 221677231 in words is "two hundred twenty-one million, six hundred seventy-seven thousand, two hundred thirty-one".