21020222112 has 24 divisors (see below), whose sum is σ = 55178083296. Its totient is φ = 7006740672.

The previous prime is 21020222099. The next prime is 21020222161. The reversal of 21020222112 is 21122202012.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×21020222112³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020222091 and 21020222100.

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, 109480228 + ... + 109480419.

It is an arithmetic number, because the mean of its divisors is an integer number (2299086804).

Almost surely, 2^21020222112 is an apocalyptic number.

It is an amenable number.

21020222112 is an abundant number, since it is smaller than the sum of its proper divisors (34157861184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020222112 is a wasteful number, since it uses less digits than its factorization.

21020222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218960660 (or 218960652 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020222112 its reverse (21122202012), we get a palindrome (42142424124).

The spelling of 21020222112 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, one hundred twelve".