20120111202221 has 6 divisors (see below), whose sum is σ = 20455356273066. Its totient is φ = 19790273310000.

The previous prime is 20120111202193. The next prime is 20120111202259. The reversal of 20120111202221 is 12220211102102.

It can be written as a sum of positive squares in 3 ways, for example, as 3412373202121 + 16707738000100 = 1847261^2 + 4087510^2 .

It is not a de Polignac number, because 20120111202221 - 2¹⁸ = 20120110940077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120111202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120111202281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2703585530 + ... + 2703592971.

It is an arithmetic number, because the mean of its divisors is an integer number (3409226045511).

Almost surely, 2^{20120111202221} is an apocalyptic number.

It is an amenable number.

20120111202221 is a deficient number, since it is larger than the sum of its proper divisors (335245070845).

20120111202221 is an frugal number, since it uses more digits than its factorization.

20120111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407178623 (or 5407178562 counting only the distinct ones).

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

Adding to 20120111202221 its reverse (12220211102102), we get a palindrome (32340322304323).

The spelling of 20120111202221 in words is "twenty trillion, one hundred twenty billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".