21230222112 has 72 divisors (see below), whose sum is σ = 65861948880. Its totient is φ = 6433399680.

The previous prime is 21230222051. The next prime is 21230222173. The reversal of 21230222112 is 21122203212.

It is an interprime number because it is at equal distance from previous prime (21230222051) and next prime (21230222173).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3347562 + ... + 3353897.

It is an arithmetic number, because the mean of its divisors is an integer number (914749290).

Almost surely, 2^21230222112 is an apocalyptic number.

21230222112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21230222112 is an abundant number, since it is smaller than the sum of its proper divisors (44631726768).

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

21230222112 is a wasteful number, since it uses less digits than its factorization.

21230222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701486 (or 6701475 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21230222112 its reverse (21122203212), we get a palindrome (42352425324).

It can be divided in two parts, 21230 and 222112, that added together give a palindrome (243342).

The spelling of 21230222112 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-two thousand, one hundred twelve".