21120894 has 24 divisors (see below), whose sum is σ = 48171240. Its totient is φ = 6669648.

The previous prime is 21120893. The next prime is 21120901. The reversal of 21120894 is 49802112.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120893) 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 11 ways as a sum of consecutive naturals, for example, 30537 + ... + 31220.

It is an arithmetic number, because the mean of its divisors is an integer number (2007135).

Almost surely, 2^21120894 is an apocalyptic number.

21120894 is an abundant number, since it is smaller than the sum of its proper divisors (27050346).

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

21120894 is a wasteful number, since it uses less digits than its factorization.

21120894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61784 (or 61781 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21120894 is about 4595.7473820914. The cubic root of 21120894 is about 276.4208293464.

The spelling of 21120894 in words is "twenty-one million, one hundred twenty thousand, eight hundred ninety-four".