21314554 has 4 divisors (see below), whose sum is σ = 31971834. Its totient is φ = 10657276.

The previous prime is 21314551. The next prime is 21314567. The reversal of 21314554 is 45541312.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 3900625 = 4173^2 + 1975^2 .

It is not an unprimeable number, because it can be changed into a prime (21314551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328637 + ... + 5328640.

Almost surely, 2^21314554 is an apocalyptic number.

21314554 is a deficient number, since it is larger than the sum of its proper divisors (10657280).

21314554 is a wasteful number, since it uses less digits than its factorization.

21314554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10657279.

The product of its digits is 2400, while the sum is 25.

The square root of 21314554 is about 4616.7687834675. The cubic root of 21314554 is about 277.2631054588.

Adding to 21314554 its reverse (45541312), we get a palindrome (66855866).

The spelling of 21314554 in words is "twenty-one million, three hundred fourteen thousand, five hundred fifty-four".