21320001212 has 12 divisors (see below), whose sum is σ = 37415698656. Its totient is φ = 10629801600.

The previous prime is 21320001167. The next prime is 21320001229. The reversal of 21320001212 is 21210002312.

It is a happy number.

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, 7548164 + ... + 7550987.

It is an arithmetic number, because the mean of its divisors is an integer number (3117974888).

Almost surely, 2^21320001212 is an apocalyptic number.

It is an amenable number.

21320001212 is a deficient number, since it is larger than the sum of its proper divisors (16095697444).

21320001212 is a wasteful number, since it uses less digits than its factorization.

21320001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15099508 (or 15099506 counting only the distinct ones).

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

Adding to 21320001212 its reverse (21210002312), we get a palindrome (42530003524).

The spelling of 21320001212 in words is "twenty-one billion, three hundred twenty million, one thousand, two hundred twelve".