221091053 has 2 divisors, whose sum is σ = 221091054. Its totient is φ = 221091052.

The previous prime is 221091043. The next prime is 221091127. The reversal of 221091053 is 350190122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150749284 + 70341769 = 12278^2 + 8387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221091053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221091043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110545526 + 110545527.

It is an arithmetic number, because the mean of its divisors is an integer number (110545527).

Almost surely, 2^221091053 is an apocalyptic number.

It is an amenable number.

221091053 is a deficient number, since it is larger than the sum of its proper divisors (1).

221091053 is an equidigital number, since it uses as much as digits as its factorization.

221091053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 221091053 is about 14869.1308757439. The cubic root of 221091053 is about 604.6773800713.

The spelling of 221091053 in words is "two hundred twenty-one million, ninety-one thousand, fifty-three".