121220112210 has 32 divisors (see below), whose sum is σ = 292713117120. Its totient is φ = 32127046848.

The previous prime is 121220112197. The next prime is 121220112239. The reversal of 121220112210 is 12211022121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121220112210.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12389805 + ... + 12399584.

It is an arithmetic number, because the mean of its divisors is an integer number (9147284910).

Almost surely, 2^121220112210 is an apocalyptic number.

121220112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121220112210 is an abundant number, since it is smaller than the sum of its proper divisors (171493004910).

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

121220112210 is a wasteful number, since it uses less digits than its factorization.

121220112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24789562.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121220112210 its reverse (12211022121), we get a palindrome (133431134331).

The spelling of 121220112210 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred ten".