23211100008721 has 2 divisors, whose sum is σ = 23211100008722. Its totient is φ = 23211100008720.

The previous prime is 23211100008641. The next prime is 23211100008743. The reversal of 23211100008721 is 12780000111232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14335795077696 + 8875304931025 = 3786264^2 + 2979145^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211100008721 - 2¹⁵ = 23211099975953 is a prime.

It is a super-2 number, since 2×23211100008721² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23211100008721.

It is not a weakly prime, because it can be changed into another prime (23211100008121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605550004360 + 11605550004361.

It is an arithmetic number, because the mean of its divisors is an integer number (11605550004361).

Almost surely, 2^{23211100008721} is an apocalyptic number.

It is an amenable number.

23211100008721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23211100008721 is an equidigital number, since it uses as much as digits as its factorization.

23211100008721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

Adding to 23211100008721 its reverse (12780000111232), we get a palindrome (35991100119953).

The spelling of 23211100008721 in words is "twenty-three trillion, two hundred eleven billion, one hundred million, eight thousand, seven hundred twenty-one".