2111011221 has 32 divisors (see below), whose sum is σ = 3105641088. Its totient is φ = 1264874240.

The previous prime is 2111011213. The next prime is 2111011241. The reversal of 2111011221 is 1221101112.

It is a cyclic number.

It is not a de Polignac number, because 2111011221 - 2³ = 2111011213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2111011197 and 2111011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111011241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1123735 + ... + 1125611.

It is an arithmetic number, because the mean of its divisors is an integer number (97051284).

Almost surely, 2^2111011221 is an apocalyptic number.

It is an amenable number.

2111011221 is a deficient number, since it is larger than the sum of its proper divisors (994629867).

2111011221 is a wasteful number, since it uses less digits than its factorization.

2111011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261.

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

The square root of 2111011221 is about 45945.7421422268. The cubic root of 2111011221 is about 1282.8134770957.

Adding to 2111011221 its reverse (1221101112), we get a palindrome (3332112333).

The spelling of 2111011221 in words is "two billion, one hundred eleven million, eleven thousand, two hundred twenty-one".