1220111121 has 8 divisors (see below), whose sum is σ = 1627292224. Its totient is φ = 813168720.

The previous prime is 1220111119. The next prime is 1220111141. The reversal of 1220111121 is 1211110221.

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

It is not a de Polignac number, because 1220111121 - 2¹ = 1220111119 is a prime.

It is a super-2 number, since 2×1220111121² = 2977342295175753282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111097 and 1220111106.

It is not an unprimeable number, because it can be changed into a prime (1220111141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47386 + ... + 68451.

It is an arithmetic number, because the mean of its divisors is an integer number (203411528).

Almost surely, 2^1220111121 is an apocalyptic number.

It is an amenable number.

1220111121 is a deficient number, since it is larger than the sum of its proper divisors (407181103).

1220111121 is a wasteful number, since it uses less digits than its factorization.

1220111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119351.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1220111121 is about 34930.0890494141. The cubic root of 1220111121 is about 1068.5621707192.

Adding to 1220111121 its reverse (1211110221), we get a palindrome (2431221342).

The spelling of 1220111121 in words is "one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".