13721231212 has 24 divisors (see below), whose sum is σ = 25862575536. Its totient is φ = 6332059968.

The previous prime is 13721231203. The next prime is 13721231239. The reversal of 13721231212 is 21213212731.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612318 + ... + 634330.

It is an arithmetic number, because the mean of its divisors is an integer number (1077607314).

Almost surely, 2^13721231212 is an apocalyptic number.

It is an amenable number.

13721231212 is a deficient number, since it is larger than the sum of its proper divisors (12141344324).

13721231212 is a wasteful number, since it uses less digits than its factorization.

13721231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34017 (or 34015 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

Adding to 13721231212 its reverse (21213212731), we get a palindrome (34934443943).

The spelling of 13721231212 in words is "thirteen billion, seven hundred twenty-one million, two hundred thirty-one thousand, two hundred twelve".