21121112204 has 12 divisors (see below), whose sum is σ = 37307385864. Its totient is φ = 10461859104.

The previous prime is 21121112197. The next prime is 21121112209. The reversal of 21121112204 is 40221112112.

It is a super-2 number, since 2×21121112204² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121112209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24673769 + ... + 24674624.

It is an arithmetic number, because the mean of its divisors is an integer number (3108948822).

Almost surely, 2^21121112204 is an apocalyptic number.

It is an amenable number.

21121112204 is a deficient number, since it is larger than the sum of its proper divisors (16186273660).

21121112204 is a wasteful number, since it uses less digits than its factorization.

21121112204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49348504 (or 49348502 counting only the distinct ones).

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

Adding to 21121112204 its reverse (40221112112), we get a palindrome (61342224316).

The spelling of 21121112204 in words is "twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, two hundred four".