204127421 has 2 divisors, whose sum is σ = 204127422. Its totient is φ = 204127420.

The previous prime is 204127379. The next prime is 204127447. The reversal of 204127421 is 124721402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112063396 + 92064025 = 10586^2 + 9595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204127421 is a prime.

It is a super-2 number, since 2×204127421² = 83336008008222482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204127471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102063710 + 102063711.

It is an arithmetic number, because the mean of its divisors is an integer number (102063711).

Almost surely, 2^204127421 is an apocalyptic number.

It is an amenable number.

204127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204127421 is an equidigital number, since it uses as much as digits as its factorization.

204127421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 204127421 is about 14287.3167879767. The cubic root of 204127421 is about 588.7990711335.

Adding to 204127421 its reverse (124721402), we get a palindrome (328848823).

The spelling of 204127421 in words is "two hundred four million, one hundred twenty-seven thousand, four hundred twenty-one".