20112220101221 has 16 divisors (see below), whose sum is σ = 21286784655360. Its totient is φ = 18962781000240.

The previous prime is 20112220101209. The next prime is 20112220101241. The reversal of 20112220101221 is 12210102221102.

It is a cyclic number.

It is not a de Polignac number, because 20112220101221 - 2⁶ = 20112220101157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20112220101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112220101241) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6370610 + ... + 8989388.

It is an arithmetic number, because the mean of its divisors is an integer number (1330424040960).

Almost surely, 2^{20112220101221} is an apocalyptic number.

It is an amenable number.

20112220101221 is a deficient number, since it is larger than the sum of its proper divisors (1174564554139).

20112220101221 is a wasteful number, since it uses less digits than its factorization.

20112220101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623576.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20112220101221 its reverse (12210102221102), we get a palindrome (32322322322323).

The spelling of 20112220101221 in words is "twenty trillion, one hundred twelve billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".