204456421436431 has 2 divisors, whose sum is σ = 204456421436432. Its totient is φ = 204456421436430.

The previous prime is 204456421436411. The next prime is 204456421436437. The reversal of 204456421436431 is 134634124654402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204456421436431 - 2⁷ = 204456421436303 is a prime.

It is a super-2 number, since 2×204456421436431² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204456421436437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102228210718215 + 102228210718216.

It is an arithmetic number, because the mean of its divisors is an integer number (102228210718216).

Almost surely, 2^{204456421436431} is an apocalyptic number.

204456421436431 is a deficient number, since it is larger than the sum of its proper divisors (1).

204456421436431 is an equidigital number, since it uses as much as digits as its factorization.

204456421436431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6635520, while the sum is 49.

The spelling of 204456421436431 in words is "two hundred four trillion, four hundred fifty-six billion, four hundred twenty-one million, four hundred thirty-six thousand, four hundred thirty-one".