21544414 has 4 divisors (see below), whose sum is σ = 32316624. Its totient is φ = 10772206.

The previous prime is 21544409. The next prime is 21544421. The reversal of 21544414 is 41444512.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5386102 + ... + 5386105.

It is an arithmetic number, because the mean of its divisors is an integer number (8079156).

Almost surely, 2^21544414 is an apocalyptic number.

21544414 is a deficient number, since it is larger than the sum of its proper divisors (10772210).

21544414 is a wasteful number, since it uses less digits than its factorization.

21544414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772209.

The product of its digits is 2560, while the sum is 25.

The square root of 21544414 is about 4641.5960617012. The cubic root of 21544414 is about 278.2562290956.

Adding to 21544414 its reverse (41444512), we get a palindrome (62988926).

The spelling of 21544414 in words is "twenty-one million, five hundred forty-four thousand, four hundred fourteen".