21896747 has 8 divisors (see below), whose sum is σ = 22552992. Its totient is φ = 21246400.

The previous prime is 21896717. The next prime is 21896767. The reversal of 21896747 is 74769812.

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

It is a cyclic number.

It is not a de Polignac number, because 21896747 - 2⁸ = 21896491 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21896698 and 21896707.

It is not an unprimeable number, because it can be changed into a prime (21896717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6722 + ... + 9432.

It is an arithmetic number, because the mean of its divisors is an integer number (2819124).

Almost surely, 2^21896747 is an apocalyptic number.

21896747 is a deficient number, since it is larger than the sum of its proper divisors (656245).

21896747 is a wasteful number, since it uses less digits than its factorization.

21896747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949.

The product of its digits is 169344, while the sum is 44.

The square root of 21896747 is about 4679.3960080335. The cubic root of 21896747 is about 279.7648834097.

The spelling of 21896747 in words is "twenty-one million, eight hundred ninety-six thousand, seven hundred forty-seven".