21798715 has 8 divisors (see below), whose sum is σ = 26183520. Its totient is φ = 17422272.

The previous prime is 21798703. The next prime is 21798727. The reversal of 21798715 is 51789712.

It is an interprime number because it is at equal distance from previous prime (21798703) and next prime (21798727).

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 21798715 - 2⁵ = 21798683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9391 + ... + 11479.

It is an arithmetic number, because the mean of its divisors is an integer number (3272940).

Almost surely, 2^21798715 is an apocalyptic number.

21798715 is a deficient number, since it is larger than the sum of its proper divisors (4384805).

21798715 is a wasteful number, since it uses less digits than its factorization.

21798715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181.

The product of its digits is 35280, while the sum is 40.

The square root of 21798715 is about 4668.9094015626. The cubic root of 21798715 is about 279.3467552152.

The spelling of 21798715 in words is "twenty-one million, seven hundred ninety-eight thousand, seven hundred fifteen".