181227095890921 has 2 divisors, whose sum is σ = 181227095890922. Its totient is φ = 181227095890920.

The previous prime is 181227095890837. The next prime is 181227095890961. The reversal of 181227095890921 is 129098590722181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179473285671696 + 1753810219225 = 13396764^2 + 1324315^2 .

It is a cyclic number.

It is not a de Polignac number, because 181227095890921 - 2⁷ = 181227095890793 is a prime.

It is not a weakly prime, because it can be changed into another prime (181227095890961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90613547945460 + 90613547945461.

It is an arithmetic number, because the mean of its divisors is an integer number (90613547945461).

Almost surely, 2^{181227095890921} is an apocalyptic number.

It is an amenable number.

181227095890921 is a deficient number, since it is larger than the sum of its proper divisors (1).

181227095890921 is an equidigital number, since it uses as much as digits as its factorization.

181227095890921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 64.

The spelling of 181227095890921 in words is "one hundred eighty-one trillion, two hundred twenty-seven billion, ninety-five million, eight hundred ninety thousand, nine hundred twenty-one".