400014021 has 12 divisors (see below), whose sum is σ = 586246976. Its totient is φ = 242432520.

The previous prime is 400014019. The next prime is 400014031. The reversal of 400014021 is 120410004.

It is not a de Polignac number, because 400014021 - 2¹ = 400014019 is a prime.

It is a super-2 number, since 2×400014021² = 320022433993176882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400013988 and 400014006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400014031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550621 + ... + 551346.

Almost surely, 2^400014021 is an apocalyptic number.

It is an amenable number.

400014021 is a deficient number, since it is larger than the sum of its proper divisors (186232955).

400014021 is a wasteful number, since it uses less digits than its factorization.

400014021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101992 (or 1101981 counting only the distinct ones).

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

The square root of 400014021 is about 20000.3505219284. The cubic root of 400014021 is about 736.8149085951.

Adding to 400014021 its reverse (120410004), we get a palindrome (520424025).

The spelling of 400014021 in words is "four hundred million, fourteen thousand, twenty-one".