2111021121 has 96 divisors (see below), whose sum is σ = 3524456448. Its totient is φ = 1108180480.

The previous prime is 2111021113. The next prime is 2111021131. The reversal of 2111021121 is 1211201112.

It is not a de Polignac number, because 2111021121 - 2³ = 2111021113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111021097 and 2111021106.

It is not an unprimeable number, because it can be changed into a prime (2111021131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 35779990 + ... + 35780048.

It is an arithmetic number, because the mean of its divisors is an integer number (36713088).

Almost surely, 2^2111021121 is an apocalyptic number.

It is an amenable number.

2111021121 is a deficient number, since it is larger than the sum of its proper divisors (1413435327).

2111021121 is a wasteful number, since it uses less digits than its factorization.

2111021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2111021121 is about 45945.8498778725. The cubic root of 2111021121 is about 1282.8154824274.

Adding to 2111021121 its reverse (1211201112), we get a palindrome (3322222233).

Subtracting from 2111021121 its reverse (1211201112), we obtain a square (899820009 = 29997²).

The spelling of 2111021121 in words is "two billion, one hundred eleven million, twenty-one thousand, one hundred twenty-one".