21042854 has 12 divisors (see below), whose sum is σ = 36717804. Its totient is φ = 9018324.

The previous prime is 21042851. The next prime is 21042863. The reversal of 21042854 is 45824012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107264 + ... + 107459.

It is an arithmetic number, because the mean of its divisors is an integer number (3059817).

Almost surely, 2^21042854 is an apocalyptic number.

21042854 is a deficient number, since it is larger than the sum of its proper divisors (15674950).

21042854 is a wasteful number, since it uses less digits than its factorization.

21042854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214739 (or 214732 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 21042854 is about 4587.2490667065. The cubic root of 21042854 is about 276.0799582800.

Adding to 21042854 its reverse (45824012), we get a palindrome (66866866).

The spelling of 21042854 in words is "twenty-one million, forty-two thousand, eight hundred fifty-four".