121220111210 has 128 divisors (see below), whose sum is σ = 244621140480. Its totient is φ = 42881126400.

The previous prime is 121220111171. The next prime is 121220111213. The reversal of 121220111210 is 12111022121.

It is not an unprimeable number, because it can be changed into a prime (121220111213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 296381486 + ... + 296381894.

It is an arithmetic number, because the mean of its divisors is an integer number (1911102660).

Almost surely, 2^121220111210 is an apocalyptic number.

121220111210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121220111210 is an abundant number, since it is smaller than the sum of its proper divisors (123401029270).

121220111210 is a wasteful number, since it uses less digits than its factorization.

121220111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121220111210 its reverse (12111022121), we get a palindrome (133331133331).

The spelling of 121220111210 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, two hundred ten".