21236054 has 32 divisors (see below), whose sum is σ = 37933056. Its totient is φ = 8724960.

The previous prime is 21236041. The next prime is 21236063. The reversal of 21236054 is 45063212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72332 + ... + 72624.

It is an arithmetic number, because the mean of its divisors is an integer number (1185408).

Almost surely, 2^21236054 is an apocalyptic number.

21236054 is a deficient number, since it is larger than the sum of its proper divisors (16697002).

21236054 is a wasteful number, since it uses less digits than its factorization.

21236054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21236054 is about 4608.2593243002. The cubic root of 21236054 is about 276.9223065783.

Adding to 21236054 its reverse (45063212), we get a palindrome (66299266).

The spelling of 21236054 in words is "twenty-one million, two hundred thirty-six thousand, fifty-four".