121212212210 has 32 divisors (see below), whose sum is σ = 232399601280. Its totient is φ = 45359571712.

The previous prime is 121212212197. The next prime is 121212212257. The reversal of 121212212210 is 12212212121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon 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, 2106380 + ... + 2163159.

It is an arithmetic number, because the mean of its divisors is an integer number (7262487540).

Almost surely, 2^121212212210 is an apocalyptic number.

121212212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121212212210 is a deficient number, since it is larger than the sum of its proper divisors (111187389070).

121212212210 is a wasteful number, since it uses less digits than its factorization.

121212212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4269730.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121212212210 its reverse (12212212121), we get a palindrome (133424424331).

The spelling of 121212212210 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, two hundred ten".