21211222112 has 24 divisors (see below), whose sum is σ = 42142716000. Its totient is φ = 10508310144.

The previous prime is 21211222103. The next prime is 21211222117. The reversal of 21211222112 is 21122211212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222117) 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, 3037112 + ... + 3044087.

It is an arithmetic number, because the mean of its divisors is an integer number (1755946500).

Almost surely, 2^21211222112 is an apocalyptic number.

It is an amenable number.

21211222112 is a deficient number, since it is larger than the sum of its proper divisors (20931493888).

21211222112 is a wasteful number, since it uses less digits than its factorization.

21211222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081318 (or 6081310 counting only the distinct ones).

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

Adding to 21211222112 its reverse (21122211212), we get a palindrome (42333433324).

The spelling of 21211222112 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twelve".