21210032112 has 40 divisors (see below), whose sum is σ = 55019968080. Its totient is φ = 7040670720.

The previous prime is 21210032089. The next prime is 21210032117. The reversal of 21210032112 is 21123001212.

It is a junction number, because it is equal to n+sod(n) for n = 21210032091 and 21210032100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210032117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905187 + ... + 928322.

It is an arithmetic number, because the mean of its divisors is an integer number (1375499202).

Almost surely, 2^21210032112 is an apocalyptic number.

It is an amenable number.

21210032112 is an abundant number, since it is smaller than the sum of its proper divisors (33809935968).

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

21210032112 is a wasteful number, since it uses less digits than its factorization.

21210032112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833761 (or 1833755 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210032112 its reverse (21123001212), we get a palindrome (42333033324).

The spelling of 21210032112 in words is "twenty-one billion, two hundred ten million, thirty-two thousand, one hundred twelve".