13721212 has 6 divisors (see below), whose sum is σ = 24012128. Its totient is φ = 6860604.

The previous prime is 13721209. The next prime is 13721231. The reversal of 13721212 is 21212731.

It is a self number, because there is not a number n which added to its sum of digits gives 13721212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1715148 + ... + 1715155.

Almost surely, 2^13721212 is an apocalyptic number.

It is an amenable number.

13721212 is a deficient number, since it is larger than the sum of its proper divisors (10290916).

13721212 is a wasteful number, since it uses less digits than its factorization.

13721212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430307 (or 3430305 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 13721212 is about 3704.2154364993. The cubic root of 13721212 is about 239.4036816158.

Adding to 13721212 its reverse (21212731), we get a palindrome (34933943).

The spelling of 13721212 in words is "thirteen million, seven hundred twenty-one thousand, two hundred twelve".