21670447343 has 2 divisors, whose sum is σ = 21670447344. Its totient is φ = 21670447342.

The previous prime is 21670447333. The next prime is 21670447363. The reversal of 21670447343 is 34374407612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21670447343 - 2⁴ = 21670447327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21670447343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21670447333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10835223671 + 10835223672.

It is an arithmetic number, because the mean of its divisors is an integer number (10835223672).

Almost surely, 2^21670447343 is an apocalyptic number.

21670447343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21670447343 is an equidigital number, since it uses as much as digits as its factorization.

21670447343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 41.

The spelling of 21670447343 in words is "twenty-one billion, six hundred seventy million, four hundred forty-seven thousand, three hundred forty-three".