21516262 has 4 divisors (see below), whose sum is σ = 32274396. Its totient is φ = 10758130.

The previous prime is 21516259. The next prime is 21516269. The reversal of 21516262 is 26261512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516269) by changing a digit.

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 as a sum of consecutive naturals, namely, 5379064 + ... + 5379067.

It is an arithmetic number, because the mean of its divisors is an integer number (8068599).

Almost surely, 2^21516262 is an apocalyptic number.

21516262 is a deficient number, since it is larger than the sum of its proper divisors (10758134).

21516262 is a wasteful number, since it uses less digits than its factorization.

21516262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758133.

The product of its digits is 1440, while the sum is 25.

The square root of 21516262 is about 4638.5624928419. The cubic root of 21516262 is about 278.1349774984.

Adding to 21516262 its reverse (26261512), we get a palindrome (47777774).

The spelling of 21516262 in words is "twenty-one million, five hundred sixteen thousand, two hundred sixty-two".