21135594 has 16 divisors (see below), whose sum is σ = 42605568. Its totient is φ = 6989472.

The previous prime is 21135593. The next prime is 21135613. The reversal of 21135594 is 49553112.

It is not an unprimeable number, because it can be changed into a prime (21135593) 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, 13107 + ... + 14630.

It is an arithmetic number, because the mean of its divisors is an integer number (2662848).

Almost surely, 2^21135594 is an apocalyptic number.

21135594 is an abundant number, since it is smaller than the sum of its proper divisors (21469974).

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

21135594 is a wasteful number, since it uses less digits than its factorization.

21135594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27869.

The product of its digits is 5400, while the sum is 30.

The square root of 21135594 is about 4597.3464085274. The cubic root of 21135594 is about 276.4849434863.

The spelling of 21135594 in words is "twenty-one million, one hundred thirty-five thousand, five hundred ninety-four".