22121211212 has 12 divisors (see below), whose sum is σ = 38725960056. Its totient is φ = 11056651200.

The previous prime is 22121211209. The next prime is 22121211221. The reversal of 22121211212 is 21211212122.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975998 + ... + 998405.

It is an arithmetic number, because the mean of its divisors is an integer number (3227163338).

Almost surely, 2^22121211212 is an apocalyptic number.

It is an amenable number.

22121211212 is a deficient number, since it is larger than the sum of its proper divisors (16604748844).

22121211212 is a wasteful number, since it uses less digits than its factorization.

22121211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977208 (or 1977206 counting only the distinct ones).

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

Adding to 22121211212 its reverse (21211212122), we get a palindrome (43332423334).

The spelling of 22121211212 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twelve".