400021113 has 16 divisors (see below), whose sum is σ = 540618176. Its totient is φ = 263070720.

The previous prime is 400021081. The next prime is 400021147. The reversal of 400021113 is 311120004.

It is a happy number.

It is not a de Polignac number, because 400021113 - 2⁵ = 400021081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400021163) 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, 94245 + ... + 98397.

It is an arithmetic number, because the mean of its divisors is an integer number (33788636).

Almost surely, 2^400021113 is an apocalyptic number.

It is an amenable number.

400021113 is a deficient number, since it is larger than the sum of its proper divisors (140597063).

400021113 is a wasteful number, since it uses less digits than its factorization.

400021113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 400021113 is about 20000.5278180352. The cubic root of 400021113 is about 736.8192629928.

Adding to 400021113 its reverse (311120004), we get a palindrome (711141117).

The spelling of 400021113 in words is "four hundred million, twenty-one thousand, one hundred thirteen".