21122313 has 16 divisors (see below), whose sum is σ = 30116736. Its totient is φ = 13121280.

The previous prime is 21122291. The next prime is 21122323. The reversal of 21122313 is 31322112.

It is not a de Polignac number, because 21122313 - 2¹⁷ = 20991241 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21122292 and 21122301.

It is not an unprimeable number, because it can be changed into a prime (21122323) 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, 3243 + ... + 7263.

It is an arithmetic number, because the mean of its divisors is an integer number (1882296).

Almost surely, 2^21122313 is an apocalyptic number.

It is an amenable number.

21122313 is a deficient number, since it is larger than the sum of its proper divisors (8994423).

21122313 is a wasteful number, since it uses less digits than its factorization.

21122313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144.

The product of its digits is 72, while the sum is 15.

The square root of 21122313 is about 4595.9017613522. The cubic root of 21122313 is about 276.4270196206.

Adding to 21122313 its reverse (31322112), we get a palindrome (52444425).

The spelling of 21122313 in words is "twenty-one million, one hundred twenty-two thousand, three hundred thirteen".