204121131223091 has 2 divisors, whose sum is σ = 204121131223092. Its totient is φ = 204121131223090.

The previous prime is 204121131223021. The next prime is 204121131223129. The reversal of 204121131223091 is 190322131121402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204121131223091 - 2⁴⁶ = 133752387045427 is a prime.

It is a super-2 number, since 2×204121131223091² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204121131223021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102060565611545 + 102060565611546.

It is an arithmetic number, because the mean of its divisors is an integer number (102060565611546).

Almost surely, 2^{204121131223091} is an apocalyptic number.

204121131223091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204121131223091 is an equidigital number, since it uses as much as digits as its factorization.

204121131223091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

Adding to 204121131223091 its reverse (190322131121402), we get a palindrome (394443262344493).

The spelling of 204121131223091 in words is "two hundred four trillion, one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-three thousand, ninety-one".