21353054 has 12 divisors (see below), whose sum is σ = 34025424. Its totient is φ = 10048224.

The previous prime is 21353053. The next prime is 21353063. The reversal of 21353054 is 45035312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17894 + ... + 19049.

It is an arithmetic number, because the mean of its divisors is an integer number (2835452).

Almost surely, 2^21353054 is an apocalyptic number.

21353054 is a deficient number, since it is larger than the sum of its proper divisors (12672370).

21353054 is a wasteful number, since it uses less digits than its factorization.

21353054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36979 (or 36962 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21353054 is about 4620.9364851727. The cubic root of 21353054 is about 277.4299430867.

Adding to 21353054 its reverse (45035312), we get a palindrome (66388366).

The spelling of 21353054 in words is "twenty-one million, three hundred fifty-three thousand, fifty-four".