21210032012 has 36 divisors (see below), whose sum is σ = 40873686840. Its totient is φ = 9623308032.

The previous prime is 21210032009. The next prime is 21210032029. The reversal of 21210032012 is 21023001212.

It is a happy number.

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, 226013 + ... + 305780.

It is an arithmetic number, because the mean of its divisors is an integer number (1135380190).

Almost surely, 2^21210032012 is an apocalyptic number.

It is an amenable number.

21210032012 is a deficient number, since it is larger than the sum of its proper divisors (19663654828).

21210032012 is a wasteful number, since it uses less digits than its factorization.

21210032012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531882 (or 531867 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210032012 its reverse (21023001212), we get a palindrome (42233033224).

The spelling of 21210032012 in words is "twenty-one billion, two hundred ten million, thirty-two thousand, twelve".