10890221 has 2 divisors, whose sum is σ = 10890222. Its totient is φ = 10890220.

The previous prime is 10890199. The next prime is 10890239. The reversal of 10890221 is 12209801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 1974025 = 2986^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 10890221 - 2⁶ = 10890157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10890241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5445110 + 5445111.

It is an arithmetic number, because the mean of its divisors is an integer number (5445111).

Almost surely, 2^10890221 is an apocalyptic number.

It is an amenable number.

10890221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10890221 is an equidigital number, since it uses as much as digits as its factorization.

10890221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 10890221 is about 3300.0334846786. The cubic root of 10890221 is about 221.6556968460.

It can be divided in two parts, 10890 and 221, that added together give a palindrome (11111).

The spelling of 10890221 in words is "ten million, eight hundred ninety thousand, two hundred twenty-one".