402144042421 has 32 divisors (see below), whose sum is σ = 450405826560. Its totient is φ = 355960987200.

The previous prime is 402144042407. The next prime is 402144042491. The reversal of 402144042421 is 124240441204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 402144042421 - 2¹¹ = 402144040373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402144042421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402144042491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53323911 + ... + 53331451.

It is an arithmetic number, because the mean of its divisors is an integer number (14075182080).

Almost surely, 2^402144042421 is an apocalyptic number.

It is an amenable number.

402144042421 is a deficient number, since it is larger than the sum of its proper divisors (48261784139).

402144042421 is a wasteful number, since it uses less digits than its factorization.

402144042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385.

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 402144042421 its reverse (124240441204), we get a palindrome (526384483625).

The spelling of 402144042421 in words is "four hundred two billion, one hundred forty-four million, forty-two thousand, four hundred twenty-one".