2120212121111 has 4 divisors (see below), whose sum is σ = 2423099566992. Its totient is φ = 1817324675232.

The previous prime is 2120212121081. The next prime is 2120212121191. The reversal of 2120212121111 is 1111212120212.

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 2120212121111 - 2²⁶ = 2120145012247 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 2120212121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120212121191) 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, 151443722930 + ... + 151443722943.

It is an arithmetic number, because the mean of its divisors is an integer number (605774891748).

Almost surely, 2^{2120212121111} is an apocalyptic number.

2120212121111 is a deficient number, since it is larger than the sum of its proper divisors (302887445881).

2120212121111 is an equidigital number, since it uses as much as digits as its factorization.

2120212121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302887445880.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2120212121111 its reverse (1111212120212), we get a palindrome (3231424241323).

The spelling of 2120212121111 in words is "two trillion, one hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eleven".