121212223031220 has 48 divisors (see below), whose sum is σ = 339932091827328. Its totient is φ = 32272034014080.

The previous prime is 121212223031171. The next prime is 121212223031279. The reversal of 121212223031220 is 22130322212121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1600757479 + ... + 1600833198.

It is an arithmetic number, because the mean of its divisors is an integer number (7081918579736).

Almost surely, 2^{121212223031220} is an apocalyptic number.

121212223031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212223031220 is an abundant number, since it is smaller than the sum of its proper divisors (218719868796108).

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

121212223031220 is a wasteful number, since it uses less digits than its factorization.

121212223031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201591320 (or 3201591318 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 121212223031220 its reverse (22130322212121), we get a palindrome (143342545243341).

The spelling of 121212223031220 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-three million, thirty-one thousand, two hundred twenty".