21095683 has 4 divisors (see below), whose sum is σ = 24109360. Its totient is φ = 18082008.

The previous prime is 21095677. The next prime is 21095693. The reversal of 21095683 is 38659012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21095683 - 2¹³ = 21087491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21095653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506828 + ... + 1506841.

It is an arithmetic number, because the mean of its divisors is an integer number (6027340).

Almost surely, 2^21095683 is an apocalyptic number.

21095683 is a deficient number, since it is larger than the sum of its proper divisors (3013677).

21095683 is an equidigital number, since it uses as much as digits as its factorization.

21095683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013676.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21095683 is about 4593.0037012831. The cubic root of 21095683 is about 276.3108021200.

Subtracting from 21095683 its sum of digits (34), we obtain a square (21095649 = 4593²).

The spelling of 21095683 in words is "twenty-one million, ninety-five thousand, six hundred eighty-three".