20101220221111 has 8 divisors (see below), whose sum is σ = 20105337823200. Its totient is φ = 20097103038240.

The previous prime is 20101220221073. The next prime is 20101220221169. The reversal of 20101220221111 is 11112202210102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101220221111 is a prime.

It is a super-4 number, since 4×20101220221111⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101220221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106650646 + ... + 106838956.

It is an arithmetic number, because the mean of its divisors is an integer number (2513167227900).

Almost surely, 2^{20101220221111} is an apocalyptic number.

20101220221111 is a deficient number, since it is larger than the sum of its proper divisors (4117602089).

20101220221111 is a wasteful number, since it uses less digits than its factorization.

20101220221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209609.

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

Adding to 20101220221111 its reverse (11112202210102), we get a palindrome (31213422431213).

The spelling of 20101220221111 in words is "twenty trillion, one hundred one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".