340440021223 has 4 divisors (see below), whose sum is σ = 343563324280. Its totient is φ = 337316718168.

The previous prime is 340440021157. The next prime is 340440021241. The reversal of 340440021223 is 322120044043.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322120044043 = 7 ⋅46017149149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340440021223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340440021253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561651365 + ... + 1561651582.

It is an arithmetic number, because the mean of its divisors is an integer number (85890831070).

Almost surely, 2^340440021223 is an apocalyptic number.

340440021223 is a deficient number, since it is larger than the sum of its proper divisors (3123303057).

340440021223 is a wasteful number, since it uses less digits than its factorization.

340440021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123303056.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 340440021223 its reverse (322120044043), we get a palindrome (662560065266).

The spelling of 340440021223 in words is "three hundred forty billion, four hundred forty million, twenty-one thousand, two hundred twenty-three".