13212121212 has 18 divisors (see below), whose sum is σ = 33397306488. Its totient is φ = 4404040392.

The previous prime is 13212121199. The next prime is 13212121243. The reversal of 13212121212 is 21212121231.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

13212121212 is a modest number, since divided by 121212 gives 13212 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183501648 + ... + 183501719.

It is an arithmetic number, because the mean of its divisors is an integer number (1855405916).

Almost surely, 2^13212121212 is an apocalyptic number.

13212121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13212121212 is an abundant number, since it is smaller than the sum of its proper divisors (20185185276).

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

13212121212 is a wasteful number, since it uses less digits than its factorization.

13212121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367003377 (or 367003372 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 13212121212 its reverse (21212121231), we get a palindrome (34424242443).

The spelling of 13212121212 in words is "thirteen billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".