21210032312 has 16 divisors (see below), whose sum is σ = 45450069360. Its totient is φ = 9090013824.

The previous prime is 21210032281. The next prime is 21210032341. The reversal of 21210032312 is 21323001212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189375233 + ... + 189375344.

It is an arithmetic number, because the mean of its divisors is an integer number (2840629335).

Almost surely, 2^21210032312 is an apocalyptic number.

It is an amenable number.

21210032312 is an abundant number, since it is smaller than the sum of its proper divisors (24240037048).

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

21210032312 is a wasteful number, since it uses less digits than its factorization.

21210032312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378750590 (or 378750586 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21210032312 its reverse (21323001212), we get a palindrome (42533033524).

The spelling of 21210032312 in words is "twenty-one billion, two hundred ten million, thirty-two thousand, three hundred twelve".