21447723683 has 2 divisors, whose sum is σ = 21447723684. Its totient is φ = 21447723682.

The previous prime is 21447723637. The next prime is 21447723707. The reversal of 21447723683 is 38632774412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21447723683 - 2²² = 21443529379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21447723623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723861841 + 10723861842.

It is an arithmetic number, because the mean of its divisors is an integer number (10723861842).

Almost surely, 2^21447723683 is an apocalyptic number.

21447723683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21447723683 is an equidigital number, since it uses as much as digits as its factorization.

21447723683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 47.

The spelling of 21447723683 in words is "twenty-one billion, four hundred forty-seven million, seven hundred twenty-three thousand, six hundred eighty-three".