21848653 has 2 divisors, whose sum is σ = 21848654. Its totient is φ = 21848652.

The previous prime is 21848647. The next prime is 21848657. The reversal of 21848653 is 35684812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21325924 + 522729 = 4618^2 + 723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21848653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21848657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10924326 + 10924327.

It is an arithmetic number, because the mean of its divisors is an integer number (10924327).

Almost surely, 2^21848653 is an apocalyptic number.

It is an amenable number.

21848653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21848653 is an equidigital number, since it uses as much as digits as its factorization.

21848653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 21848653 is about 4674.2542720738. The cubic root of 21848653 is about 279.5599081349.

The spelling of 21848653 in words is "twenty-one million, eight hundred forty-eight thousand, six hundred fifty-three".