400413331421 has 4 divisors (see below), whose sum is σ = 400879471200. Its totient is φ = 399947191644.

The previous prime is 400413331399. The next prime is 400413331429. The reversal of 400413331421 is 124133314004.

It is a happy number.

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-400413331421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400413331429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233068601 + ... + 233070318.

It is an arithmetic number, because the mean of its divisors is an integer number (100219867800).

Almost surely, 2^400413331421 is an apocalyptic number.

It is an amenable number.

400413331421 is a deficient number, since it is larger than the sum of its proper divisors (466139779).

400413331421 is an equidigital number, since it uses as much as digits as its factorization.

400413331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466139778.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 400413331421 its reverse (124133314004), we get a palindrome (524546645425).

The spelling of 400413331421 in words is "four hundred billion, four hundred thirteen million, three hundred thirty-one thousand, four hundred twenty-one".