21054363 has 24 divisors (see below), whose sum is σ = 31868928. Its totient is φ = 12342000.

The previous prime is 21054353. The next prime is 21054373. The reversal of 21054363 is 36345012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21054353) and next prime (21054373).

It is not a de Polignac number, because 21054363 - 2¹³ = 21046171 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21054323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10318 + ... + 12188.

It is an arithmetic number, because the mean of its divisors is an integer number (1327872).

Almost surely, 2^21054363 is an apocalyptic number.

21054363 is a deficient number, since it is larger than the sum of its proper divisors (10814565).

21054363 is a wasteful number, since it uses less digits than its factorization.

21054363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1916 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21054363 is about 4588.5033507670. The cubic root of 21054363 is about 276.1302813832.

Adding to 21054363 its reverse (36345012), we get a palindrome (57399375).

The spelling of 21054363 in words is "twenty-one million, fifty-four thousand, three hundred sixty-three".