1220001121 has 8 divisors (see below), whose sum is σ = 1277581824. Its totient is φ = 1162798560.

The previous prime is 1220001109. The next prime is 1220001131. The reversal of 1220001121 is 1211000221.

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 1220001121 - 2⁵ = 1220001089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220001098 and 1220001107.

It is not an unprimeable number, because it can be changed into a prime (1220001131) 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, 87921 + ... + 100846.

It is an arithmetic number, because the mean of its divisors is an integer number (159697728).

Almost surely, 2^1220001121 is an apocalyptic number.

It is an amenable number.

1220001121 is a deficient number, since it is larger than the sum of its proper divisors (57580703).

1220001121 is a wasteful number, since it uses less digits than its factorization.

1220001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189071.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1220001121 is about 34928.5144402106. The cubic root of 1220001121 is about 1068.5300574225.

Adding to 1220001121 its reverse (1211000221), we get a palindrome (2431001342).

The spelling of 1220001121 in words is "one billion, two hundred twenty million, one thousand, one hundred twenty-one".