21112854 has 16 divisors (see below), whose sum is σ = 48258048. Its totient is φ = 6032232.

The previous prime is 21112843. The next prime is 21112859. The reversal of 21112854 is 45821112.

It is a super-3 number, since 3×21112854³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112859) 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, 251302 + ... + 251385.

It is an arithmetic number, because the mean of its divisors is an integer number (3016128).

Almost surely, 2^21112854 is an apocalyptic number.

21112854 is an abundant number, since it is smaller than the sum of its proper divisors (27145194).

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

21112854 is a wasteful number, since it uses less digits than its factorization.

21112854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502699.

The product of its digits is 640, while the sum is 24.

The square root of 21112854 is about 4594.8725771233. The cubic root of 21112854 is about 276.3857502516.

Adding to 21112854 its reverse (45821112), we get a palindrome (66933966).

The spelling of 21112854 in words is "twenty-one million, one hundred twelve thousand, eight hundred fifty-four".