12131222213 has 4 divisors (see below), whose sum is σ = 13234060608. Its totient is φ = 11028383820.

The previous prime is 12131222209. The next prime is 12131222231. The reversal of 12131222213 is 31222213121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12131222213 - 2² = 12131222209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131222293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551419181 + ... + 551419202.

It is an arithmetic number, because the mean of its divisors is an integer number (3308515152).

Almost surely, 2^12131222213 is an apocalyptic number.

It is an amenable number.

12131222213 is a deficient number, since it is larger than the sum of its proper divisors (1102838395).

12131222213 is a wasteful number, since it uses less digits than its factorization.

12131222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102838394.

The product of its digits is 288, while the sum is 20.

Adding to 12131222213 its reverse (31222213121), we get a palindrome (43353435334).

It can be divided in two parts, 121 and 31222213, that multiplied together give a palindrome (3777887773).

The spelling of 12131222213 in words is "twelve billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred thirteen".