21515114 has 4 divisors (see below), whose sum is σ = 32272674. Its totient is φ = 10757556.

The previous prime is 21515113. The next prime is 21515159. The reversal of 21515114 is 41151512.

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., 21003889 + 511225 = 4583^2 + 715^2 .

It is not an unprimeable number, because it can be changed into a prime (21515113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378777 + ... + 5378780.

Almost surely, 2^21515114 is an apocalyptic number.

21515114 is a deficient number, since it is larger than the sum of its proper divisors (10757560).

21515114 is a wasteful number, since it uses less digits than its factorization.

21515114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757559.

The product of its digits is 200, while the sum is 20.

The square root of 21515114 is about 4638.4387459575. The cubic root of 21515114 is about 278.1300307805.

Adding to 21515114 its reverse (41151512), we get a palindrome (62666626).

The spelling of 21515114 in words is "twenty-one million, five hundred fifteen thousand, one hundred fourteen".