21202112112 has 20 divisors (see below), whose sum is σ = 54772123080. Its totient is φ = 7067370688.

The previous prime is 21202112101. The next prime is 21202112153. The reversal of 21202112112 is 21121120212.

It is a junction number, because it is equal to n+sod(n) for n = 21202112091 and 21202112100.

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, 220855287 + ... + 220855382.

It is an arithmetic number, because the mean of its divisors is an integer number (2738606154).

Almost surely, 2^21202112112 is an apocalyptic number.

It is an amenable number.

21202112112 is an abundant number, since it is smaller than the sum of its proper divisors (33570010968).

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

21202112112 is a wasteful number, since it uses less digits than its factorization.

21202112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441710680 (or 441710674 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202112112 its reverse (21121120212), we get a palindrome (42323232324).

The spelling of 21202112112 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred twelve".