40400032421 has 16 divisors (see below), whose sum is σ = 46648794240. Its totient is φ = 34270900800.

The previous prime is 40400032417. The next prime is 40400032433. The reversal of 40400032421 is 12423000404.

It is a cyclic number.

It is not a de Polignac number, because 40400032421 - 2² = 40400032417 is a prime.

It is a super-2 number, since 2×40400032421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40400032393 and 40400032402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400032451) 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, 1812275 + ... + 1834431.

It is an arithmetic number, because the mean of its divisors is an integer number (2915549640).

Almost surely, 2^40400032421 is an apocalyptic number.

It is an amenable number.

40400032421 is a deficient number, since it is larger than the sum of its proper divisors (6248761819).

40400032421 is a wasteful number, since it uses less digits than its factorization.

40400032421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24844.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 40400032421 its reverse (12423000404), we get a palindrome (52823032825).

The spelling of 40400032421 in words is "forty billion, four hundred million, thirty-two thousand, four hundred twenty-one".