21116337 has 16 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 12765200.

The previous prime is 21116317. The next prime is 21116351. The reversal of 21116337 is 73361112.

It is a cyclic number.

It is not a de Polignac number, because 21116337 - 2⁶ = 21116273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21116317) 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 in 15 ways as a sum of consecutive naturals, for example, 21262 + ... + 22232.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^21116337 is an apocalyptic number.

It is an amenable number.

21116337 is a deficient number, since it is larger than the sum of its proper divisors (9676623).

21116337 is a wasteful number, since it uses less digits than its factorization.

21116337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its digits is 756, while the sum is 24.

The square root of 21116337 is about 4595.2515709154. The cubic root of 21116337 is about 276.4009479228.

Adding to 21116337 its reverse (73361112), we get a palindrome (94477449).

It can be divided in two parts, 2111 and 6337, that added together give a palindrome (8448).

The spelling of 21116337 in words is "twenty-one million, one hundred sixteen thousand, three hundred thirty-seven".