21652887 has 4 divisors (see below), whose sum is σ = 28870520. Its totient is φ = 14435256.

The previous prime is 21652871. The next prime is 21652901. The reversal of 21652887 is 78825612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21652887 - 2⁴ = 21652871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652847) 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 3 ways as a sum of consecutive naturals, for example, 3608812 + ... + 3608817.

It is an arithmetic number, because the mean of its divisors is an integer number (7217630).

Almost surely, 2^21652887 is an apocalyptic number.

21652887 is a deficient number, since it is larger than the sum of its proper divisors (7217633).

21652887 is an equidigital number, since it uses as much as digits as its factorization.

21652887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7217632.

The product of its digits is 53760, while the sum is 39.

The square root of 21652887 is about 4653.2662722006. The cubic root of 21652887 is about 278.7224407859.

The spelling of 21652887 in words is "twenty-one million, six hundred fifty-two thousand, eight hundred eighty-seven".