121131221210 has 16 divisors (see below), whose sum is σ = 218503093536. Its totient is φ = 48348733968.

The previous prime is 121131221191. The next prime is 121131221243. The reversal of 121131221210 is 12122131121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12964412 + ... + 12973751.

It is an arithmetic number, because the mean of its divisors is an integer number (13656443346).

Almost surely, 2^121131221210 is an apocalyptic number.

121131221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121131221210 is a deficient number, since it is larger than the sum of its proper divisors (97371872326).

121131221210 is a wasteful number, since it uses less digits than its factorization.

121131221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25938637.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121131221210 its reverse (12122131121), we get a palindrome (133253352331).

The spelling of 121131221210 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred ten".