21022221112 has 16 divisors (see below), whose sum is σ = 39453831000. Its totient is φ = 10501199520.

The previous prime is 21022221107. The next prime is 21022221163. The reversal of 21022221112 is 21112222012.

It is a happy number.

It is a congruent number.

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, 1229862 + ... + 1246837.

Almost surely, 2^21022221112 is an apocalyptic number.

It is an amenable number.

21022221112 is a deficient number, since it is larger than the sum of its proper divisors (18431609888).

21022221112 is a wasteful number, since it uses less digits than its factorization.

21022221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477766 (or 2477762 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022221112 its reverse (21112222012), we get a palindrome (42134443124).

The spelling of 21022221112 in words is "twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred twelve".