131121212 has 6 divisors (see below), whose sum is σ = 229462128.
Its totient is φ = 65560604.
The previous prime is 131121181. The next prime is 131121241. The reversal of 131121212 is 212121131.
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, 16390148 + ... + 16390155.
It is an arithmetic number, because the mean of its divisors is an integer number (38243688).
Almost surely, 2131121212 is an apocalyptic number.
It is an amenable number.
131121212 is a deficient number, since it is larger than the sum of its proper divisors (98340916).
131121212 is a wasteful number, since it uses less digits than its factorization.
131121212 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 32780307 (or 32780305 counting only the distinct ones).
The product of its digits is 24, while the sum is 14.
The square root of 131121212 is about 11450.8170887496.
The cubic root of 131121212 is about 508.0319022270.
Adding to 131121212 its reverse (212121131), we get a palindrome (343242343).
The spelling of 131121212 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred twelve".