340421421 has 8 divisors (see below), whose sum is σ = 454015584. Its totient is φ = 226887440.

The previous prime is 340421407. The next prime is 340421437. The reversal of 340421421 is 124124043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 340421421 - 2¹⁸ = 340159277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340421441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430 + ... + 26096.

It is an arithmetic number, because the mean of its divisors is an integer number (56751948).

Almost surely, 2^340421421 is an apocalyptic number.

It is an amenable number.

340421421 is a deficient number, since it is larger than the sum of its proper divisors (113594163).

340421421 is a wasteful number, since it uses less digits than its factorization.

340421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30091.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 340421421 is about 18450.5127571024. The cubic root of 340421421 is about 698.2414504733.

Adding to 340421421 its reverse (124124043), we get a palindrome (464545464).

The spelling of 340421421 in words is "three hundred forty million, four hundred twenty-one thousand, four hundred twenty-one".