21095706 has 16 divisors (see below), whose sum is σ = 42292800. Its totient is φ = 7015008.

The previous prime is 21095699. The next prime is 21095729. The reversal of 21095706 is 60759012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (2643300).

Almost surely, 2^21095706 is an apocalyptic number.

21095706 is an abundant number, since it is smaller than the sum of its proper divisors (21197094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21095706 is a wasteful number, since it uses less digits than its factorization.

21095706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8453.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 21095706 is about 4593.0062050905. The cubic root of 21095706 is about 276.3109025377.

The spelling of 21095706 in words is "twenty-one million, ninety-five thousand, seven hundred six".