221061413 has 2 divisors, whose sum is σ = 221061414. Its totient is φ = 221061412.

The previous prime is 221061397. The next prime is 221061437. The reversal of 221061413 is 314160122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171034084 + 50027329 = 13078^2 + 7073^2 .

It is a cyclic number.

It is not a de Polignac number, because 221061413 - 2⁴ = 221061397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221061443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110530706 + 110530707.

It is an arithmetic number, because the mean of its divisors is an integer number (110530707).

Almost surely, 2^221061413 is an apocalyptic number.

It is an amenable number.

221061413 is a deficient number, since it is larger than the sum of its proper divisors (1).

221061413 is an equidigital number, since it uses as much as digits as its factorization.

221061413 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 20.

The square root of 221061413 is about 14868.1341465565. The cubic root of 221061413 is about 604.6503573609.

The spelling of 221061413 in words is "two hundred twenty-one million, sixty-one thousand, four hundred thirteen".