221002231 has 2 divisors, whose sum is σ = 221002232. Its totient is φ = 221002230.

The previous prime is 221002211. The next prime is 221002273. The reversal of 221002231 is 132200122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002231 is a prime.

It is a super-2 number, since 2×221002231² = 97683972213954722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221002211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501115 + 110501116.

It is an arithmetic number, because the mean of its divisors is an integer number (110501116).

Almost surely, 2^221002231 is an apocalyptic number.

221002231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002231 is an equidigital number, since it uses as much as digits as its factorization.

221002231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221002231 is about 14866.1437837793. The cubic root of 221002231 is about 604.5963940590.

Adding to 221002231 its reverse (132200122), we get a palindrome (353202353).

The spelling of 221002231 in words is "two hundred twenty-one million, two thousand, two hundred thirty-one".