340431021 has 12 divisors (see below), whose sum is σ = 561981472. Its totient is φ = 194531976.

The previous prime is 340431017. The next prime is 340431071. The reversal of 340431021 is 120134043.

It is not a de Polignac number, because 340431021 - 2² = 340431017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340430985 and 340431003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340431071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2701771 + ... + 2701896.

Almost surely, 2^340431021 is an apocalyptic number.

It is an amenable number.

340431021 is a deficient number, since it is larger than the sum of its proper divisors (221550451).

340431021 is a wasteful number, since it uses less digits than its factorization.

340431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5403680 (or 5403677 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 340431021 is about 18450.7729106398. The cubic root of 340431021 is about 698.2480139605.

Adding to 340431021 its reverse (120134043), we get a palindrome (460565064).

The spelling of 340431021 in words is "three hundred forty million, four hundred thirty-one thousand, twenty-one".