402144442121 has 2 divisors, whose sum is σ = 402144442122. Its totient is φ = 402144442120.

The previous prime is 402144442093. The next prime is 402144442177. The reversal of 402144442121 is 121244441204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233350828096 + 168793614025 = 483064^2 + 410845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402144442121 is a prime.

It is not a weakly prime, because it can be changed into another prime (402144442421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201072221060 + 201072221061.

It is an arithmetic number, because the mean of its divisors is an integer number (201072221061).

Almost surely, 2^402144442121 is an apocalyptic number.

It is an amenable number.

402144442121 is a deficient number, since it is larger than the sum of its proper divisors (1).

402144442121 is an equidigital number, since it uses as much as digits as its factorization.

402144442121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 402144442121 its reverse (121244441204), we get a palindrome (523388883325).

The spelling of 402144442121 in words is "four hundred two billion, one hundred forty-four million, four hundred forty-two thousand, one hundred twenty-one".