21342002369 has 2 divisors, whose sum is σ = 21342002370. Its totient is φ = 21342002368.

The previous prime is 21342002329. The next prime is 21342002389. The reversal of 21342002369 is 96320024312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21311620225 + 30382144 = 145985^2 + 5512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342002369 is a prime.

It is a super-2 number, since 2×21342002369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21342002329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671001184 + 10671001185.

It is an arithmetic number, because the mean of its divisors is an integer number (10671001185).

Almost surely, 2^21342002369 is an apocalyptic number.

It is an amenable number.

21342002369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342002369 is an equidigital number, since it uses as much as digits as its factorization.

21342002369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21342002369 in words is "twenty-one billion, three hundred forty-two million, two thousand, three hundred sixty-nine".