221092513 has 2 divisors, whose sum is σ = 221092514. Its totient is φ = 221092512.

The previous prime is 221092511. The next prime is 221092519. The reversal of 221092513 is 315290122.

It is a happy number.

221092513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151486864 + 69605649 = 12308^2 + 8343^2 .

It is a cyclic number.

It is not a de Polignac number, because 221092513 - 2¹ = 221092511 is a prime.

Together with 221092511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221092511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110546256 + 110546257.

It is an arithmetic number, because the mean of its divisors is an integer number (110546257).

Almost surely, 2^221092513 is an apocalyptic number.

It is an amenable number.

221092513 is a deficient number, since it is larger than the sum of its proper divisors (1).

221092513 is an equidigital number, since it uses as much as digits as its factorization.

221092513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 221092513 is about 14869.1799706642. The cubic root of 221092513 is about 604.6787110871.

The spelling of 221092513 in words is "two hundred twenty-one million, ninety-two thousand, five hundred thirteen".