2120111021 has 16 divisors (see below), whose sum is σ = 2580367104. Its totient is φ = 1700438784.

The previous prime is 2120111011. The next prime is 2120111023. The reversal of 2120111021 is 1201110212.

It is a cyclic number.

It is not a de Polignac number, because 2120111021 - 2⁶ = 2120110957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120110993 and 2120111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120111023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30905 + ... + 72078.

It is an arithmetic number, because the mean of its divisors is an integer number (161272944).

Almost surely, 2^2120111021 is an apocalyptic number.

It is an amenable number.

2120111021 is a deficient number, since it is larger than the sum of its proper divisors (460256083).

2120111021 is a wasteful number, since it uses less digits than its factorization.

2120111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103180.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2120111021 is about 46044.6633281209. The cubic root of 2120111021 is about 1284.6540820209.

Adding to 2120111021 its reverse (1201110212), we get a palindrome (3321221233).

It can be divided in two parts, 2 and 120111021, that multiplied together give a palindrome (240222042).

The spelling of 2120111021 in words is "two billion, one hundred twenty million, one hundred eleven thousand, twenty-one".