2111221204 has 12 divisors (see below), whose sum is σ = 3699143028. Its totient is φ = 1054323200.

The previous prime is 2111221193. The next prime is 2111221207. The reversal of 2111221204 is 4021221112.

It can be written as a sum of positive squares in 2 ways, for example, as 578498704 + 1532722500 = 24052^2 + 39150^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221207) 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, 318157 + ... + 324724.

It is an arithmetic number, because the mean of its divisors is an integer number (308261919).

Almost surely, 2^2111221204 is an apocalyptic number.

It is an amenable number.

2111221204 is a deficient number, since it is larger than the sum of its proper divisors (1587921824).

2111221204 is a wasteful number, since it uses less digits than its factorization.

2111221204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643706 (or 643704 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2111221204 is about 45948.0272046581. The cubic root of 2111221204 is about 1282.8560096489.

Adding to 2111221204 its reverse (4021221112), we get a palindrome (6132442316).

The spelling of 2111221204 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred four".