11212121204 has 12 divisors (see below), whose sum is σ = 19635512484. Its totient is φ = 5601974784.

The previous prime is 11212121191. The next prime is 11212121209. The reversal of 11212121204 is 40212121211.

It can be written as a sum of positive squares in 2 ways, for example, as 10820160400 + 391960804 = 104020^2 + 19798^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212121209) 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, 1015277 + ... + 1026260.

It is an arithmetic number, because the mean of its divisors is an integer number (1636292707).

Almost surely, 2^11212121204 is an apocalyptic number.

It is an amenable number.

11212121204 is a deficient number, since it is larger than the sum of its proper divisors (8423391280).

11212121204 is a wasteful number, since it uses less digits than its factorization.

11212121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042914 (or 2042912 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11212121204 its reverse (40212121211), we get a palindrome (51424242415).

The spelling of 11212121204 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred four".