21111322213 has 4 divisors (see below), whose sum is σ = 21117949600. Its totient is φ = 21104694828.

The previous prime is 21111322171. The next prime is 21111322223. The reversal of 21111322213 is 31222311112.

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 a de Polignac number, because none of the positive numbers 2^k-21111322213 is a prime.

It is a super-2 number, since 2×21111322213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111322223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3308913 + ... + 3315286.

It is an arithmetic number, because the mean of its divisors is an integer number (5279487400).

Almost surely, 2^21111322213 is an apocalyptic number.

It is an amenable number.

21111322213 is a deficient number, since it is larger than the sum of its proper divisors (6627387).

21111322213 is an equidigital number, since it uses as much as digits as its factorization.

21111322213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6627386.

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

Adding to 21111322213 its reverse (31222311112), we get a palindrome (52333633325).

The spelling of 21111322213 in words is "twenty-one billion, one hundred eleven million, three hundred twenty-two thousand, two hundred thirteen".