2219621 has 2 divisors, whose sum is σ = 2219622. Its totient is φ = 2219620.

The previous prime is 2219563. The next prime is 2219629. The reversal of 2219621 is 1269122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 2500 = 1489^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 2219621 - 2⁶ = 2219557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2219629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109810 + 1109811.

It is an arithmetic number, because the mean of its divisors is an integer number (1109811).

2^2219621 is an apocalyptic number.

It is an amenable number.

2219621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2219621 is an equidigital number, since it uses as much as digits as its factorization.

2219621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 2219621 is about 1489.8392530740. The cubic root of 2219621 is about 130.4446509555. Note that the first 3 decimals are identical.

The spelling of 2219621 in words is "two million, two hundred nineteen thousand, six hundred twenty-one".