121212011221210 has 128 divisors (see below), whose sum is σ = 284339364664320. Its totient is φ = 36103491293184.

The previous prime is 121212011221207. The next prime is 121212011221229. The reversal of 121212011221210 is 12122110212121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 390137347 + ... + 390447913.

It is an arithmetic number, because the mean of its divisors is an integer number (2221401286440).

Almost surely, 2^{121212011221210} is an apocalyptic number.

121212011221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121212011221210 is an abundant number, since it is smaller than the sum of its proper divisors (163127353443110).

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

121212011221210 is a wasteful number, since it uses less digits than its factorization.

121212011221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335840.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121212011221210 its reverse (12122110212121), we get a palindrome (133334121433331).

The spelling of 121212011221210 in words is "one hundred twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty-one thousand, two hundred ten".