221356013 has 2 divisors, whose sum is σ = 221356014. Its totient is φ = 221356012.

The previous prime is 221355991. The next prime is 221356019. The reversal of 221356013 is 310653122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194128489 + 27227524 = 13933^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 221356013 - 2⁶ = 221355949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221356013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221356019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110678006 + 110678007.

It is an arithmetic number, because the mean of its divisors is an integer number (110678007).

Almost surely, 2^221356013 is an apocalyptic number.

It is an amenable number.

221356013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221356013 is an equidigital number, since it uses as much as digits as its factorization.

221356013 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 23.

The square root of 221356013 is about 14878.0379418793. The cubic root of 221356013 is about 604.9188361852.

The spelling of 221356013 in words is "two hundred twenty-one million, three hundred fifty-six thousand, thirteen".