40431012021 has 6 divisors (see below), whose sum is σ = 58400350710. Its totient is φ = 26954008008.

The previous prime is 40431012007. The next prime is 40431012031. The reversal of 40431012021 is 12021013404.

It can be written as a sum of positive squares in only one way, i.e., 39055640625 + 1375371396 = 197625^2 + 37086^2 .

It is not a de Polignac number, because 40431012021 - 2⁵ = 40431011989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40431011985 and 40431012003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40431012031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2246167326 + ... + 2246167343.

It is an arithmetic number, because the mean of its divisors is an integer number (9733391785).

Almost surely, 2^40431012021 is an apocalyptic number.

It is an amenable number.

40431012021 is a deficient number, since it is larger than the sum of its proper divisors (17969338689).

40431012021 is a wasteful number, since it uses less digits than its factorization.

40431012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492334675 (or 4492334672 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 40431012021 its reverse (12021013404), we get a palindrome (52452025425).

It can be divided in two parts, 4043 and 1012021, that added together give a square (1016064 = 1008²).

The spelling of 40431012021 in words is "forty billion, four hundred thirty-one million, twelve thousand, twenty-one".