21536893 has 4 divisors (see below), whose sum is σ = 24613600. Its totient is φ = 18460188.

The previous prime is 21536891. The next prime is 21536897. The reversal of 21536893 is 39863512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21536893 - 2¹ = 21536891 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 (21536891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538343 + ... + 1538356.

It is an arithmetic number, because the mean of its divisors is an integer number (6153400).

Almost surely, 2^21536893 is an apocalyptic number.

It is an amenable number.

21536893 is a deficient number, since it is larger than the sum of its proper divisors (3076707).

21536893 is an equidigital number, since it uses as much as digits as its factorization.

21536893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076706.

The product of its digits is 38880, while the sum is 37.

The square root of 21536893 is about 4640.7858170788. The cubic root of 21536893 is about 278.2238462443.

The spelling of 21536893 in words is "twenty-one million, five hundred thirty-six thousand, eight hundred ninety-three".