2204213621 has 2 divisors, whose sum is σ = 2204213622. Its totient is φ = 2204213620.

The previous prime is 2204213603. The next prime is 2204213633. The reversal of 2204213621 is 1263124022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1322776900 + 881436721 = 36370^2 + 29689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2204213621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2204215621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102106810 + 1102106811.

It is an arithmetic number, because the mean of its divisors is an integer number (1102106811).

Almost surely, 2^2204213621 is an apocalyptic number.

It is an amenable number.

2204213621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2204213621 is an equidigital number, since it uses as much as digits as its factorization.

2204213621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 2204213621 is about 46949.0534622371. The cubic root of 2204213621 is about 1301.4212505546.

Adding to 2204213621 its reverse (1263124022), we get a palindrome (3467337643).

The spelling of 2204213621 in words is "two billion, two hundred four million, two hundred thirteen thousand, six hundred twenty-one".