340023503021 has 2 divisors, whose sum is σ = 340023503022. Its totient is φ = 340023503020.

The previous prime is 340023502969. The next prime is 340023503023. The reversal of 340023503021 is 120305320043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311592822025 + 28430680996 = 558205^2 + 168614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340023503021 is a prime.

It is a super-2 number, since 2×340023503021² (a number of 24 digits) contains 22 as substring.

Together with 340023503023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340023503023) 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 as a sum of consecutive naturals, namely, 170011751510 + 170011751511.

It is an arithmetic number, because the mean of its divisors is an integer number (170011751511).

Almost surely, 2^340023503021 is an apocalyptic number.

It is an amenable number.

340023503021 is a deficient number, since it is larger than the sum of its proper divisors (1).

340023503021 is an equidigital number, since it uses as much as digits as its factorization.

340023503021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 340023503021 its reverse (120305320043), we get a palindrome (460328823064).

The spelling of 340023503021 in words is "three hundred forty billion, twenty-three million, five hundred three thousand, twenty-one".