340223521 has 16 divisors (see below), whose sum is σ = 393090048. Its totient is φ = 291416400.

The previous prime is 340223509. The next prime is 340223561. The reversal of 340223521 is 125322043.

It is not a de Polignac number, because 340223521 - 2¹¹ = 340221473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340223492 and 340223501.

It is not an unprimeable number, because it can be changed into a prime (340223501) 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, 6916 + ... + 26986.

It is an arithmetic number, because the mean of its divisors is an integer number (24568128).

Almost surely, 2^340223521 is an apocalyptic number.

It is an amenable number.

340223521 is a deficient number, since it is larger than the sum of its proper divisors (52866527).

340223521 is a wasteful number, since it uses less digits than its factorization.

340223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20172.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 340223521 is about 18445.1489828627. The cubic root of 340223521 is about 698.1061194199.

Adding to 340223521 its reverse (125322043), we get a palindrome (465545564).

The spelling of 340223521 in words is "three hundred forty million, two hundred twenty-three thousand, five hundred twenty-one".