12812201021111 has 4 divisors (see below), whose sum is σ = 12812255396952. Its totient is φ = 12812146645272.

The previous prime is 12812201021069. The next prime is 12812201021141. The reversal of 12812201021111 is 11112010221821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12812201021111 - 2²⁶ = 12812133912247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12812201021141) 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, 26832941 + ... + 27306246.

It is an arithmetic number, because the mean of its divisors is an integer number (3203063849238).

Almost surely, 2^{12812201021111} is an apocalyptic number.

12812201021111 is a deficient number, since it is larger than the sum of its proper divisors (54375841).

12812201021111 is an equidigital number, since it uses as much as digits as its factorization.

12812201021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54375840.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 12812201021111 its reverse (11112010221821), we get a palindrome (23924211242932).

The spelling of 12812201021111 in words is "twelve trillion, eight hundred twelve billion, two hundred one million, twenty-one thousand, one hundred eleven".