21302254 has 8 divisors (see below), whose sum is σ = 32263920. Its totient is φ = 10547616.

The previous prime is 21302251. The next prime is 21302261. The reversal of 21302254 is 45220312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302251) 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 3 ways as a sum of consecutive naturals, for example, 51499 + ... + 51910.

It is an arithmetic number, because the mean of its divisors is an integer number (4032990).

Almost surely, 2^21302254 is an apocalyptic number.

21302254 is a deficient number, since it is larger than the sum of its proper divisors (10961666).

21302254 is a wasteful number, since it uses less digits than its factorization.

21302254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103514.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21302254 is about 4615.4364907341. The cubic root of 21302254 is about 277.2097617449.

Adding to 21302254 its reverse (45220312), we get a palindrome (66522566).

The spelling of 21302254 in words is "twenty-one million, three hundred two thousand, two hundred fifty-four".