220121111121 has 8 divisors (see below), whose sum is σ = 293605203360. Its totient is φ = 146692213152.

The previous prime is 220121111099. The next prime is 220121111137. The reversal of 220121111121 is 121111121022.

It is a happy number.

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

It is not a de Polignac number, because 220121111121 - 2¹⁴ = 220121094737 is a prime.

It is a super-2 number, since 2×220121111121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220121111121.

It is not an unprimeable number, because it can be changed into a prime (220121111191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13789260 + ... + 13805213.

It is an arithmetic number, because the mean of its divisors is an integer number (36700650420).

Almost surely, 2^220121111121 is an apocalyptic number.

It is an amenable number.

220121111121 is a deficient number, since it is larger than the sum of its proper divisors (73484092239).

220121111121 is a wasteful number, since it uses less digits than its factorization.

220121111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27597135.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 220121111121 its reverse (121111121022), we get a palindrome (341232232143).

Subtracting from 220121111121 its reverse (121111121022), we obtain a palindrome (99009990099).

The spelling of 220121111121 in words is "two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".