21112221313 has 4 divisors (see below), whose sum is σ = 21603203248. Its totient is φ = 20621239380.

The previous prime is 21112221311. The next prime is 21112221323. The reversal of 21112221313 is 31312221112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21112221313 - 2¹ = 21112221311 is a prime.

It is a super-3 number, since 3×21112221313³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245490903 + ... + 245490988.

It is an arithmetic number, because the mean of its divisors is an integer number (5400800812).

Almost surely, 2^21112221313 is an apocalyptic number.

It is an amenable number.

21112221313 is a deficient number, since it is larger than the sum of its proper divisors (490981935).

21112221313 is an equidigital number, since it uses as much as digits as its factorization.

21112221313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490981934.

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

Adding to 21112221313 its reverse (31312221112), we get a palindrome (52424442425).

The spelling of 21112221313 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, three hundred thirteen".