21132894 has 16 divisors (see below), whose sum is σ = 42387840. Its totient is φ = 7023960.

The previous prime is 21132893. The next prime is 21132899. The reversal of 21132894 is 49823112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132893) 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 7 ways as a sum of consecutive naturals, for example, 2752 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (2649240).

Almost surely, 2^21132894 is an apocalyptic number.

21132894 is an abundant number, since it is smaller than the sum of its proper divisors (21254946).

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

21132894 is a wasteful number, since it uses less digits than its factorization.

21132894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10175.

The product of its digits is 3456, while the sum is 30.

The square root of 21132894 is about 4597.0527514920. The cubic root of 21132894 is about 276.4731696490.

The spelling of 21132894 in words is "twenty-one million, one hundred thirty-two thousand, eight hundred ninety-four".