400424334621 has 16 divisors (see below), whose sum is σ = 535466687040. Its totient is φ = 266165926400.

The previous prime is 400424334551. The next prime is 400424334697. The reversal of 400424334621 is 126433424004.

It is a cyclic number.

It is not a de Polignac number, because 400424334621 - 2²⁷ = 400290116893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400424336621) 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, 19794250 + ... + 19814468.

It is an arithmetic number, because the mean of its divisors is an integer number (33466667940).

Almost surely, 2^400424334621 is an apocalyptic number.

It is an amenable number.

400424334621 is a deficient number, since it is larger than the sum of its proper divisors (135042352419).

400424334621 is a wasteful number, since it uses less digits than its factorization.

400424334621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39276.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 400424334621 its reverse (126433424004), we get a palindrome (526857758625).

The spelling of 400424334621 in words is "four hundred billion, four hundred twenty-four million, three hundred thirty-four thousand, six hundred twenty-one".