121221120112210 has 16 divisors (see below), whose sum is σ = 218198431420992. Its totient is φ = 48488355774000.

The previous prime is 121221120112181. The next prime is 121221120112217. The reversal of 121221120112210 is 12211021122121.

It is a happy number.

It is a super-2 number, since 2×121221120112210² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121221120112217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5884326 + ... + 16645345.

It is an arithmetic number, because the mean of its divisors is an integer number (13637401963812).

Almost surely, 2^{121221120112210} is an apocalyptic number.

121221120112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221120112210 is a deficient number, since it is larger than the sum of its proper divisors (96977311308782).

121221120112210 is a wasteful number, since it uses less digits than its factorization.

121221120112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23067729.

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

Adding to 121221120112210 its reverse (12211021122121), we get a palindrome (133432141234331).

The spelling of 121221120112210 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twelve thousand, two hundred ten".