404142121 has 2 divisors, whose sum is σ = 404142122. Its totient is φ = 404142120.

The previous prime is 404142113. The next prime is 404142163. The reversal of 404142121 is 121241404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360582121 + 43560000 = 18989^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 404142121 - 2³ = 404142113 is a prime.

It is not a weakly prime, because it can be changed into another prime (404142181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202071060 + 202071061.

It is an arithmetic number, because the mean of its divisors is an integer number (202071061).

Almost surely, 2^404142121 is an apocalyptic number.

It is an amenable number.

404142121 is a deficient number, since it is larger than the sum of its proper divisors (1).

404142121 is an equidigital number, since it uses as much as digits as its factorization.

404142121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 404142121 is about 20103.2863233850. The cubic root of 404142121 is about 739.3408551002.

Adding to 404142121 its reverse (121241404), we get a palindrome (525383525).

The spelling of 404142121 in words is "four hundred four million, one hundred forty-two thousand, one hundred twenty-one".