21036854 has 16 divisors (see below), whose sum is σ = 34228656. Its totient is φ = 9657600.

The previous prime is 21036833. The next prime is 21036877. The reversal of 21036854 is 45863012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6152 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (2139291).

Almost surely, 2^21036854 is an apocalyptic number.

21036854 is a deficient number, since it is larger than the sum of its proper divisors (13191802).

21036854 is a wasteful number, since it uses less digits than its factorization.

21036854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15151.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21036854 is about 4586.5950333554. The cubic root of 21036854 is about 276.0537160030.

Adding to 21036854 its reverse (45863012), we get a palindrome (66899866).

The spelling of 21036854 in words is "twenty-one million, thirty-six thousand, eight hundred fifty-four".