220121111221 has 8 divisors (see below), whose sum is σ = 240175276704. Its totient is φ = 200074138320.

The previous prime is 220121111191. The next prime is 220121111261. The reversal of 220121111221 is 122111121022.

220121111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 220121111221 - 2¹³ = 220121103029 is a prime.

It is a super-2 number, since 2×220121111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220121111195 and 220121111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121111261) 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, 1734051 + ... + 1856656.

It is an arithmetic number, because the mean of its divisors is an integer number (30021909588).

Almost surely, 2^220121111221 is an apocalyptic number.

It is an amenable number.

220121111221 is a deficient number, since it is larger than the sum of its proper divisors (20054165483).

220121111221 is a wasteful number, since it uses less digits than its factorization.

220121111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596291.

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

Adding to 220121111221 its reverse (122111121022), we get a palindrome (342232232243).

The spelling of 220121111221 in words is "two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".