2111220221 has 8 divisors (see below), whose sum is σ = 2322185088. Its totient is φ = 1919289900.

The previous prime is 2111220211. The next prime is 2111220227. The reversal of 2111220221 is 1220221112.

It is a de Polignac number, because none of the positive numbers 2^k-2111220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111220196 and 2111220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111220227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791765 + ... + 794426.

It is an arithmetic number, because the mean of its divisors is an integer number (290273136).

Almost surely, 2^2111220221 is an apocalyptic number.

It is an amenable number.

2111220221 is a deficient number, since it is larger than the sum of its proper divisors (210964867).

2111220221 is an equidigital number, since it uses as much as digits as its factorization.

2111220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586224 (or 1586202 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2111220221 is about 45948.0165077885. The cubic root of 2111220221 is about 1282.8558105465.

Adding to 2111220221 its reverse (1220221112), we get a palindrome (3331441333).

The spelling of 2111220221 in words is "two billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".