1220003121 has 16 divisors (see below), whose sum is σ = 1656976320. Its totient is φ = 798228480.

The previous prime is 1220003119. The next prime is 1220003143. The reversal of 1220003121 is 1213000221.

It is not a de Polignac number, because 1220003121 - 2¹ = 1220003119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220003097 and 1220003106.

It is not an unprimeable number, because it can be changed into a prime (1220003921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108081 + ... + 118833.

It is an arithmetic number, because the mean of its divisors is an integer number (103561020).

Almost surely, 2^1220003121 is an apocalyptic number.

It is an amenable number.

1220003121 is a deficient number, since it is larger than the sum of its proper divisors (436973199).

1220003121 is a wasteful number, since it uses less digits than its factorization.

1220003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11456.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220003121 is about 34928.5430701024. The cubic root of 1220003121 is about 1068.5306413179.

Adding to 1220003121 its reverse (1213000221), we get a palindrome (2433003342).

The spelling of 1220003121 in words is "one billion, two hundred twenty million, three thousand, one hundred twenty-one".