400321403021232 has 400 divisors, whose sum is σ = 1444595795165952. Its totient is φ = 103976002045440.

The previous prime is 400321403021191. The next prime is 400321403021299. The reversal of 400321403021232 is 232120304123004.

400321403021232 is a `hidden beast` number, since 4 + 0 + 0 + 3 + 2 + 1 + 403 + 0 + 21 + 232 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 400321403021196 and 400321403021205.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4135631458 + ... + 4135728254.

Almost surely, 2^{400321403021232} is an apocalyptic number.

400321403021232 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400321403021232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722297897582976).

400321403021232 is an abundant number, since it is smaller than the sum of its proper divisors (1044274392144720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400321403021232 is a wasteful number, since it uses less digits than its factorization.

400321403021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138278 (or 138263 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 400321403021232 its reverse (232120304123004), we get a palindrome (632441707144236).

The spelling of 400321403021232 in words is "four hundred trillion, three hundred twenty-one billion, four hundred three million, twenty-one thousand, two hundred thirty-two".