400410021 has 16 divisors (see below), whose sum is σ = 588962880. Its totient is φ = 239944320.

The previous prime is 400410019. The next prime is 400410053. The reversal of 400410021 is 120014004.

It is not a de Polignac number, because 400410021 - 2¹ = 400410019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400409979 and 400410006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400410001) 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, 65230 + ... + 71103.

It is an arithmetic number, because the mean of its divisors is an integer number (36810180).

Almost surely, 2^400410021 is an apocalyptic number.

It is an amenable number.

400410021 is a deficient number, since it is larger than the sum of its proper divisors (188552859).

400410021 is a wasteful number, since it uses less digits than its factorization.

400410021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136436.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 400410021 is about 20010.2478995139. The cubic root of 400410021 is about 737.0579688028.

Adding to 400410021 its reverse (120014004), we get a palindrome (520424025).

The spelling of 400410021 in words is "four hundred million, four hundred ten thousand, twenty-one".