400021135 has 16 divisors (see below), whose sum is σ = 509716800. Its totient is φ = 300330496.

The previous prime is 400021081. The next prime is 400021147. The reversal of 400021135 is 531120004.

It is a cyclic number.

It is not a de Polignac number, because 400021135 - 2⁷ = 400021007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23961 + ... + 37069.

It is an arithmetic number, because the mean of its divisors is an integer number (31857300).

Almost surely, 2^400021135 is an apocalyptic number.

400021135 is a deficient number, since it is larger than the sum of its proper divisors (109695665).

400021135 is a wasteful number, since it uses less digits than its factorization.

400021135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13490.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 400021135 is about 20000.5283680207. The cubic root of 400021135 is about 736.8192765005.

Adding to 400021135 its reverse (531120004), we get a palindrome (931141139).

The spelling of 400021135 in words is "four hundred million, twenty-one thousand, one hundred thirty-five".