2102111213231 has 4 divisors (see below), whose sum is σ = 2102118154872. Its totient is φ = 2102104271592.

The previous prime is 2102111213203. The next prime is 2102111213239. The reversal of 2102111213231 is 1323121112012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102111213231 is a prime.

It is a super-2 number, since 2×2102111213231² (a number of 25 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 (2102111213239) 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, 2994821 + ... + 3629486.

It is an arithmetic number, because the mean of its divisors is an integer number (525529538718).

Almost surely, 2^{2102111213231} is an apocalyptic number.

2102111213231 is a deficient number, since it is larger than the sum of its proper divisors (6941641).

2102111213231 is an equidigital number, since it uses as much as digits as its factorization.

2102111213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6941640.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2102111213231 its reverse (1323121112012), we get a palindrome (3425232325243).

The spelling of 2102111213231 in words is "two trillion, one hundred two billion, one hundred eleven million, two hundred thirteen thousand, two hundred thirty-one".