19364221 has 2 divisors, whose sum is σ = 19364222. Its totient is φ = 19364220.

The previous prime is 19364201. The next prime is 19364227. The reversal of 19364221 is 12246391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 3276100 = 4011^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 19364221 - 2¹¹ = 19362173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19364221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19364227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9682110 + 9682111.

It is an arithmetic number, because the mean of its divisors is an integer number (9682111).

Almost surely, 2^19364221 is an apocalyptic number.

It is an amenable number.

19364221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19364221 is an equidigital number, since it uses as much as digits as its factorization.

19364221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 19364221 is about 4400.4796329491. The cubic root of 19364221 is about 268.5344508549.

The spelling of 19364221 in words is "nineteen million, three hundred sixty-four thousand, two hundred twenty-one".