21848651 has 16 divisors (see below), whose sum is σ = 25349760. Its totient is φ = 18622080.

The previous prime is 21848647. The next prime is 21848653. The reversal of 21848651 is 15684812.

It is a cyclic number.

It is not a de Polignac number, because 21848651 - 2² = 21848647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21848653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21875 + ... + 22851.

It is an arithmetic number, because the mean of its divisors is an integer number (1584360).

Almost surely, 2^21848651 is an apocalyptic number.

21848651 is a deficient number, since it is larger than the sum of its proper divisors (3501109).

21848651 is a wasteful number, since it uses less digits than its factorization.

21848651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114.

The product of its digits is 15360, while the sum is 35.

The square root of 21848651 is about 4674.2540581359. The cubic root of 21848651 is about 279.5598996047.

The spelling of 21848651 in words is "twenty-one million, eight hundred forty-eight thousand, six hundred fifty-one".