21121122313 has 8 divisors (see below), whose sum is σ = 21835122848. Its totient is φ = 20417249664.

The previous prime is 21121122301. The next prime is 21121122349. The reversal of 21121122313 is 31322112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121122313 is a prime.

It is a super-2 number, since 2×21121122313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121122413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527731 + ... + 2536072.

It is an arithmetic number, because the mean of its divisors is an integer number (2729390356).

Almost surely, 2^21121122313 is an apocalyptic number.

It is an amenable number.

21121122313 is a deficient number, since it is larger than the sum of its proper divisors (714000535).

21121122313 is an equidigital number, since it uses as much as digits as its factorization.

21121122313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063943.

The product of its digits is 144, while the sum is 19.

Adding to 21121122313 its reverse (31322112112), we get a palindrome (52443234425).

The spelling of 21121122313 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, three hundred thirteen".