2193976621 has 2 divisors, whose sum is σ = 2193976622. Its totient is φ = 2193976620.

The previous prime is 2193976619. The next prime is 2193976627. The reversal of 2193976621 is 1266793912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2134902025 + 59074596 = 46205^2 + 7686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193976621 - 2¹ = 2193976619 is a prime.

Together with 2193976619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2193976627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096988310 + 1096988311.

It is an arithmetic number, because the mean of its divisors is an integer number (1096988311).

Almost surely, 2^2193976621 is an apocalyptic number.

It is an amenable number.

2193976621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193976621 is an equidigital number, since it uses as much as digits as its factorization.

2193976621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 2193976621 is about 46839.9041523358. The cubic root of 2193976621 is about 1299.4033990285.

The spelling of 2193976621 in words is "two billion, one hundred ninety-three million, nine hundred seventy-six thousand, six hundred twenty-one".