400122421 has 16 divisors (see below), whose sum is σ = 451505664. Its totient is φ = 352532224.

The previous prime is 400122413. The next prime is 400122431. The reversal of 400122421 is 124221004.

It is not a de Polignac number, because 400122421 - 2³ = 400122413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400122395 and 400122404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400122431) 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, 7491 + ... + 29263.

It is an arithmetic number, because the mean of its divisors is an integer number (28219104).

Almost surely, 2^400122421 is an apocalyptic number.

It is an amenable number.

400122421 is a deficient number, since it is larger than the sum of its proper divisors (51383243).

400122421 is a wasteful number, since it uses less digits than its factorization.

400122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21860.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400122421 is about 20003.0602908655. The cubic root of 400122421 is about 736.8814591977.

Adding to 400122421 its reverse (124221004), we get a palindrome (524343425).

The spelling of 400122421 in words is "four hundred million, one hundred twenty-two thousand, four hundred twenty-one".