21374403403343 has 2 divisors, whose sum is σ = 21374403403344. Its totient is φ = 21374403403342.

The previous prime is 21374403403271. The next prime is 21374403403417. The reversal of 21374403403343 is 34330430447312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21374403403343 is a prime.

It is a super-2 number, since 2×21374403403343² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21374403403343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374403403043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687201701671 + 10687201701672.

It is an arithmetic number, because the mean of its divisors is an integer number (10687201701672).

Almost surely, 2^{21374403403343} is an apocalyptic number.

21374403403343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374403403343 is an equidigital number, since it uses as much as digits as its factorization.

21374403403343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 41.

The spelling of 21374403403343 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred three million, four hundred three thousand, three hundred forty-three".