221949373 has 2 divisors, whose sum is σ = 221949374. Its totient is φ = 221949372.

The previous prime is 221949361. The next prime is 221949401. The reversal of 221949373 is 373949122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216737284 + 5212089 = 14722^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 221949373 - 2⁵ = 221949341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221949323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110974686 + 110974687.

It is an arithmetic number, because the mean of its divisors is an integer number (110974687).

Almost surely, 2^221949373 is an apocalyptic number.

It is an amenable number.

221949373 is a deficient number, since it is larger than the sum of its proper divisors (1).

221949373 is an equidigital number, since it uses as much as digits as its factorization.

221949373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 221949373 is about 14897.9653979998. The cubic root of 221949373 is about 605.4588627789.

The spelling of 221949373 in words is "two hundred twenty-one million, nine hundred forty-nine thousand, three hundred seventy-three".