204021120427 has 2 divisors, whose sum is σ = 204021120428. Its totient is φ = 204021120426.

The previous prime is 204021120377. The next prime is 204021120497. The reversal of 204021120427 is 724021120402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204021120427 is a prime.

It is not a weakly prime, because it can be changed into another prime (204021120497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102010560213 + 102010560214.

It is an arithmetic number, because the mean of its divisors is an integer number (102010560214).

Almost surely, 2^204021120427 is an apocalyptic number.

204021120427 is a deficient number, since it is larger than the sum of its proper divisors (1).

204021120427 is an equidigital number, since it uses as much as digits as its factorization.

204021120427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

Subtracting from 204021120427 its sum of digits (25), we obtain a palindrome (204021120402).

Adding to 204021120427 its reverse (724021120402), we get a palindrome (928042240829).

The spelling of 204021120427 in words is "two hundred four billion, twenty-one million, one hundred twenty thousand, four hundred twenty-seven".