220121220111101 has 4 divisors (see below), whose sum is σ = 220121389122204. Its totient is φ = 220121051100000.

The previous prime is 220121220111071. The next prime is 220121220111109. The reversal of 220121220111101 is 101111022121022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68498962488100 + 151622257623001 = 8276410^2 + 12313499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220121220111101 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 220121220111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121220111109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82536650 + ... + 85161851.

It is an arithmetic number, because the mean of its divisors is an integer number (55030347280551).

Almost surely, 2^{220121220111101} is an apocalyptic number.

It is an amenable number.

220121220111101 is a deficient number, since it is larger than the sum of its proper divisors (169011103).

220121220111101 is a wasteful number, since it uses less digits than its factorization.

220121220111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169011102.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 220121220111101 its reverse (101111022121022), we get a palindrome (321232242232123).

The spelling of 220121220111101 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred one".