431040021 has 16 divisors (see below), whose sum is σ = 595330560. Its totient is φ = 277081280.

The previous prime is 431040013. The next prime is 431040131. The reversal of 431040021 is 120040134.

It is a cyclic number.

It is not a de Polignac number, because 431040021 - 2³ = 431040013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431040521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72211 + ... + 77951.

It is an arithmetic number, because the mean of its divisors is an integer number (37208160).

Almost surely, 2^431040021 is an apocalyptic number.

It is an amenable number.

431040021 is a deficient number, since it is larger than the sum of its proper divisors (164290539).

431040021 is a wasteful number, since it uses less digits than its factorization.

431040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6636.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 431040021 is about 20761.5033415213. The cubic root of 431040021 is about 755.3922619916.

Adding to 431040021 its reverse (120040134), we get a palindrome (551080155).

The spelling of 431040021 in words is "four hundred thirty-one million, forty thousand, twenty-one".