21281514 has 16 divisors (see below), whose sum is σ = 43366752. Its totient is φ = 6959888.

The previous prime is 21281503. The next prime is 21281527. The reversal of 21281514 is 41518212.

It is a Curzon 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 in 7 ways as a sum of consecutive naturals, for example, 33144 + ... + 33779.

It is an arithmetic number, because the mean of its divisors is an integer number (2710422).

Almost surely, 2^21281514 is an apocalyptic number.

21281514 is an abundant number, since it is smaller than the sum of its proper divisors (22085238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21281514 is a wasteful number, since it uses less digits than its factorization.

21281514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66981.

The product of its digits is 640, while the sum is 24.

The square root of 21281514 is about 4613.1891355114. The cubic root of 21281514 is about 277.1197681801.

Adding to 21281514 its reverse (41518212), we get a palindrome (62799726).

The spelling of 21281514 in words is "twenty-one million, two hundred eighty-one thousand, five hundred fourteen".