2199823506721 has 2 divisors, whose sum is σ = 2199823506722. Its totient is φ = 2199823506720.

The previous prime is 2199823506707. The next prime is 2199823506763. The reversal of 2199823506721 is 1276053289912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2167846914321 + 31976592400 = 1472361^2 + 178820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2199823506721 - 2¹⁷ = 2199823375649 is a prime.

It is not a weakly prime, because it can be changed into another prime (2199823506521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099911753360 + 1099911753361.

It is an arithmetic number, because the mean of its divisors is an integer number (1099911753361).

Almost surely, 2^{2199823506721} is an apocalyptic number.

It is an amenable number.

2199823506721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2199823506721 is an equidigital number, since it uses as much as digits as its factorization.

2199823506721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 2199823506721 in words is "two trillion, one hundred ninety-nine billion, eight hundred twenty-three million, five hundred six thousand, seven hundred twenty-one".