121201221111210 has 128 divisors (see below), whose sum is σ = 328060172563200. Its totient is φ = 31837882809600.

The previous prime is 121201221111199. The next prime is 121201221111211. The reversal of 121201221111210 is 12111122102121.

It is a happy number.

121201221111210 is a `hidden beast` number, since 1 + 2 + 120 + 1 + 221 + 111 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121201221111211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5908240 + ... + 16652619.

It is an arithmetic number, because the mean of its divisors is an integer number (2562970098150).

Almost surely, 2^{121201221111210} is an apocalyptic number.

121201221111210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121201221111210 is an abundant number, since it is smaller than the sum of its proper divisors (206858951451990).

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

121201221111210 is a wasteful number, since it uses less digits than its factorization.

121201221111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22561173 (or 22561167 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121201221111210 its reverse (12111122102121), we get a palindrome (133312343213331).

The spelling of 121201221111210 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred ten".