20121211222210 has 32 divisors (see below), whose sum is σ = 43827041589120. Its totient is φ = 6492895049472.

The previous prime is 20121211222207. The next prime is 20121211222271. The reversal of 20121211222210 is 1222211212102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8454289240 + ... + 8454291619.

It is an arithmetic number, because the mean of its divisors is an integer number (1369595049660).

Almost surely, 2^{20121211222210} is an apocalyptic number.

20121211222210 is an abundant number, since it is smaller than the sum of its proper divisors (23705830366910).

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

20121211222210 is a wasteful number, since it uses less digits than its factorization.

20121211222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16908580890.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20121211222210 its reverse (1222211212102), we get a palindrome (21343422434312).

The spelling of 20121211222210 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred ten".