402440231421 has 12 divisors (see below), whose sum is σ = 588306202848. Its totient is φ = 265061035464.

The previous prime is 402440231399. The next prime is 402440231429. The reversal of 402440231421 is 124132044204.

402440231421 is a `hidden beast` number, since 4 + 0 + 2 + 4 + 4 + 0 + 231 + 421 = 666.

It is not a de Polignac number, because 402440231421 - 2³⁴ = 385260362237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440231429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269370225 + ... + 269371718.

It is an arithmetic number, because the mean of its divisors is an integer number (49025516904).

Almost surely, 2^402440231421 is an apocalyptic number.

It is an amenable number.

402440231421 is a deficient number, since it is larger than the sum of its proper divisors (185865971427).

402440231421 is a wasteful number, since it uses less digits than its factorization.

402440231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538742032 (or 538742029 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 402440231421 its reverse (124132044204), we get a palindrome (526572275625).

The spelling of 402440231421 in words is "four hundred two billion, four hundred forty million, two hundred thirty-one thousand, four hundred twenty-one".