22121111212 has 48 divisors (see below), whose sum is σ = 42796615680. Its totient is φ = 9951425792.

The previous prime is 22121111197. The next prime is 22121111239. The reversal of 22121111212 is 21211112122.

It is a super-2 number, since 2×22121111212² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3655173 + ... + 3661219.

It is an arithmetic number, because the mean of its divisors is an integer number (891596160).

Almost surely, 2^22121111212 is an apocalyptic number.

It is an amenable number.

22121111212 is a deficient number, since it is larger than the sum of its proper divisors (20675504468).

22121111212 is a wasteful number, since it uses less digits than its factorization.

22121111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8430 (or 8428 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 22121111212 its reverse (21211112122), we get a palindrome (43332223334).

It can be divided in two parts, 2 and 2121111212, that multiplied together give a palindrome (4242222424).

The spelling of 22121111212 in words is "twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".