1220111001 has 24 divisors (see below), whose sum is σ = 1811912960. Its totient is φ = 790593696.

The previous prime is 1220110999. The next prime is 1220111017. The reversal of 1220111001 is 1001110221.

It is a happy number.

It is not a de Polignac number, because 1220111001 - 2¹ = 1220110999 is a prime.

It is a super-2 number, since 2×1220111001² = 2977341709522444002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220111701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 584706 + ... + 586788.

Almost surely, 2^1220111001 is an apocalyptic number.

It is an amenable number.

1220111001 is a deficient number, since it is larger than the sum of its proper divisors (591801959).

1220111001 is a wasteful number, since it uses less digits than its factorization.

1220111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885 (or 3882 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1220111001 is about 34930.0873316973. The cubic root of 1220111001 is about 1068.5621356876.

Adding to 1220111001 its reverse (1001110221), we get a palindrome (2221221222).

The spelling of 1220111001 in words is "one billion, two hundred twenty million, one hundred eleven thousand, one".