21495706 has 8 divisors (see below), whose sum is σ = 32790240. Its totient is φ = 10565628.

The previous prime is 21495703. The next prime is 21495709. The reversal of 21495706 is 60759412.

It is an interprime number because it is at equal distance from previous prime (21495703) and next prime (21495709).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21495703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90966 + ... + 91201.

It is an arithmetic number, because the mean of its divisors is an integer number (4098780).

Almost surely, 2^21495706 is an apocalyptic number.

21495706 is a deficient number, since it is larger than the sum of its proper divisors (11294534).

21495706 is a wasteful number, since it uses less digits than its factorization.

21495706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182228.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21495706 is about 4636.3461906980. The cubic root of 21495706 is about 278.0463753008.

It can be divided in two parts, 21495 and 706, that added together give a square (22201 = 149²).

The spelling of 21495706 in words is "twenty-one million, four hundred ninety-five thousand, seven hundred six".