21534683 has 2 divisors, whose sum is σ = 21534684. Its totient is φ = 21534682.

The previous prime is 21534659. The next prime is 21534727. The reversal of 21534683 is 38643512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21534683 - 2²⁰ = 20486107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21534083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767341 + 10767342.

It is an arithmetic number, because the mean of its divisors is an integer number (10767342).

Almost surely, 2^21534683 is an apocalyptic number.

21534683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21534683 is an equidigital number, since it uses as much as digits as its factorization.

21534683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 21534683 is about 4640.5477047435. The cubic root of 21534683 is about 278.2143293077.

The spelling of 21534683 in words is "twenty-one million, five hundred thirty-four thousand, six hundred eighty-three".