21212341113 has 16 divisors (see below), whose sum is σ = 28936436480. Its totient is φ = 13818594816.

The previous prime is 21212341109. The next prime is 21212341147. The reversal of 21212341113 is 31114321212.

It is not a de Polignac number, because 21212341113 - 2² = 21212341109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212341113.

It is not an unprimeable number, because it can be changed into a prime (21212341193) 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, 438370 + ... + 484347.

It is an arithmetic number, because the mean of its divisors is an integer number (1808527280).

Almost surely, 2^21212341113 is an apocalyptic number.

It is an amenable number.

21212341113 is a deficient number, since it is larger than the sum of its proper divisors (7724095367).

21212341113 is an equidigital number, since it uses as much as digits as its factorization.

21212341113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922896.

The product of its digits is 288, while the sum is 21.

Adding to 21212341113 its reverse (31114321212), we get a palindrome (52326662325).

The spelling of 21212341113 in words is "twenty-one billion, two hundred twelve million, three hundred forty-one thousand, one hundred thirteen".