2120021111111 has 4 divisors (see below), whose sum is σ = 2244728235312. Its totient is φ = 1995313986912.

The previous prime is 2120021111107. The next prime is 2120021111113. The reversal of 2120021111111 is 1111111200212.

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 2120021111111 - 2² = 2120021111107 is a prime.

It is a Duffinian number.

2120021111111 is a modest number, since divided by 1111111 gives 212002 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120021111113) 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, 62353562075 + ... + 62353562108.

It is an arithmetic number, because the mean of its divisors is an integer number (561182058828).

Almost surely, 2^{2120021111111} is an apocalyptic number.

2120021111111 is a deficient number, since it is larger than the sum of its proper divisors (124707124201).

2120021111111 is a wasteful number, since it uses less digits than its factorization.

2120021111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124707124200.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2120021111111 its reverse (1111111200212), we get a palindrome (3231132311323).

The spelling of 2120021111111 in words is "two trillion, one hundred twenty billion, twenty-one million, one hundred eleven thousand, one hundred eleven".