20121220111210 has 16 divisors (see below), whose sum is σ = 36221405245056. Its totient is φ = 8047774923408.

The previous prime is 20121220111199. The next prime is 20121220111241. The reversal of 20121220111210 is 1211102212102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89021622 + ... + 89247361.

It is an arithmetic number, because the mean of its divisors is an integer number (2263837827816).

Almost surely, 2^{20121220111210} is an apocalyptic number.

20121220111210 is a deficient number, since it is larger than the sum of its proper divisors (16100185133846).

20121220111210 is a wasteful number, since it uses less digits than its factorization.

20121220111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178280277.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121220111210 its reverse (1211102212102), we get a palindrome (21332322323312).

The spelling of 20121220111210 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, two hundred ten".