2120111101001 has 4 divisors (see below), whose sum is σ = 2122517584404. Its totient is φ = 2117704617600.

The previous prime is 2120111100977. The next prime is 2120111101021. The reversal of 2120111101001 is 1001011110212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1229767884601 + 890343216400 = 1108949^2 + 943580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120111101001 - 2²⁶ = 2120043992137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120111101021) 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, 1203240380 + ... + 1203242141.

It is an arithmetic number, because the mean of its divisors is an integer number (530629396101).

Almost surely, 2^{2120111101001} is an apocalyptic number.

It is an amenable number.

2120111101001 is a deficient number, since it is larger than the sum of its proper divisors (2406483403).

2120111101001 is an equidigital number, since it uses as much as digits as its factorization.

2120111101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406483402.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 2120111101001 its reverse (1001011110212), we get a palindrome (3121122211213).

The spelling of 2120111101001 in words is "two trillion, one hundred twenty billion, one hundred eleven million, one hundred one thousand, one".