21314553 has 16 divisors (see below), whose sum is σ = 31434816. Its totient is φ = 12761280.

The previous prime is 21314551. The next prime is 21314567. The reversal of 21314553 is 35541312.

It is not a de Polignac number, because 21314553 - 2¹ = 21314551 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 5943 + ... + 8828.

It is an arithmetic number, because the mean of its divisors is an integer number (1964676).

Almost surely, 2^21314553 is an apocalyptic number.

It is an amenable number.

21314553 is a deficient number, since it is larger than the sum of its proper divisors (10120263).

21314553 is a wasteful number, since it uses less digits than its factorization.

21314553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14824.

The product of its digits is 1800, while the sum is 24.

The square root of 21314553 is about 4616.7686751666. The cubic root of 21314553 is about 277.2631011227.

Adding to 21314553 its reverse (35541312), we get a palindrome (56855865).

The spelling of 21314553 in words is "twenty-one million, three hundred fourteen thousand, five hundred fifty-three".