2213123621 has 2 divisors, whose sum is σ = 2213123622. Its totient is φ = 2213123620.

The previous prime is 2213123609. The next prime is 2213123623. The reversal of 2213123621 is 1263213122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2074802500 + 138321121 = 45550^2 + 11761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2213123621 is a prime.

Together with 2213123623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2213123623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106561810 + 1106561811.

It is an arithmetic number, because the mean of its divisors is an integer number (1106561811).

Almost surely, 2^2213123621 is an apocalyptic number.

It is an amenable number.

2213123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2213123621 is an equidigital number, since it uses as much as digits as its factorization.

2213123621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 2213123621 is about 47043.8478549534. The cubic root of 2213123621 is about 1303.1724531913.

Adding to 2213123621 its reverse (1263213122), we get a palindrome (3476336743).

The spelling of 2213123621 in words is "two billion, two hundred thirteen million, one hundred twenty-three thousand, six hundred twenty-one".