21413254 has 4 divisors (see below), whose sum is σ = 32119884. Its totient is φ = 10706626.

The previous prime is 21413243. The next prime is 21413279. The reversal of 21413254 is 45231412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5353312 + ... + 5353315.

It is an arithmetic number, because the mean of its divisors is an integer number (8029971).

Almost surely, 2^21413254 is an apocalyptic number.

21413254 is a deficient number, since it is larger than the sum of its proper divisors (10706630).

21413254 is a wasteful number, since it uses less digits than its factorization.

21413254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706629.

The product of its digits is 960, while the sum is 22.

The square root of 21413254 is about 4627.4457317185. The cubic root of 21413254 is about 277.6904149919.

Adding to 21413254 its reverse (45231412), we get a palindrome (66644666).

The spelling of 21413254 in words is "twenty-one million, four hundred thirteen thousand, two hundred fifty-four".