21324894 has 16 divisors (see below), whose sum is σ = 43287168. Its totient is φ = 7002072.

The previous prime is 21324893. The next prime is 21324923. The reversal of 21324894 is 49842312.

It is a super-2 number, since 2×21324894² = 909502208222472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26122 + ... + 26925.

It is an arithmetic number, because the mean of its divisors is an integer number (2705448).

Almost surely, 2^21324894 is an apocalyptic number.

21324894 is an abundant number, since it is smaller than the sum of its proper divisors (21962274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324894 is a wasteful number, since it uses less digits than its factorization.

21324894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53119.

The product of its digits is 13824, while the sum is 33.

The square root of 21324894 is about 4617.8884785148. Note that the first 3 decimals coincide. The cubic root of 21324894 is about 277.3079329984.

The spelling of 21324894 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred ninety-four".