400023122321 has 4 divisors (see below), whose sum is σ = 405993616752. Its totient is φ = 394052627892.

The previous prime is 400023122311. The next prime is 400023122329. The reversal of 400023122321 is 123221320004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400023122321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400023122293 and 400023122302.

It is not an unprimeable number, because it can be changed into a prime (400023122329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2985247115 + ... + 2985247248.

It is an arithmetic number, because the mean of its divisors is an integer number (101498404188).

Almost surely, 2^400023122321 is an apocalyptic number.

It is an amenable number.

400023122321 is a deficient number, since it is larger than the sum of its proper divisors (5970494431).

400023122321 is an equidigital number, since it uses as much as digits as its factorization.

400023122321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5970494430.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 400023122321 its reverse (123221320004), we get a palindrome (523244442325).

The spelling of 400023122321 in words is "four hundred billion, twenty-three million, one hundred twenty-two thousand, three hundred twenty-one".