402340123121 has 16 divisors (see below), whose sum is σ = 417545226000. Its totient is φ = 387224533248.

The previous prime is 402340123109. The next prime is 402340123127. The reversal of 402340123121 is 121321043204.

It can be written as a sum of positive squares in 8 ways, for example, as 2997015025 + 399343108096 = 54745^2 + 631936^2 .

It is not a de Polignac number, because 402340123121 - 2¹⁸ = 402339860977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402340123127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46926791 + ... + 46935363.

It is an arithmetic number, because the mean of its divisors is an integer number (26096576625).

Almost surely, 2^402340123121 is an apocalyptic number.

It is an amenable number.

402340123121 is a deficient number, since it is larger than the sum of its proper divisors (15205102879).

402340123121 is a wasteful number, since it uses less digits than its factorization.

402340123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13588.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 402340123121 its reverse (121321043204), we get a palindrome (523661166325).

The spelling of 402340123121 in words is "four hundred two billion, three hundred forty million, one hundred twenty-three thousand, one hundred twenty-one".