1220121003 has 32 divisors (see below), whose sum is σ = 1702010880. Its totient is φ = 776921600.

The previous prime is 1220120989. The next prime is 1220121017. The reversal of 1220121003 is 3001210221.

It is an interprime number because it is at equal distance from previous prime (1220120989) and next prime (1220121017).

It is a cyclic number.

It is not a de Polignac number, because 1220121003 - 2⁸ = 1220120747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220121003.

It is not an unprimeable number, because it can be changed into a prime (1220121073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1059478 + ... + 1060628.

It is an arithmetic number, because the mean of its divisors is an integer number (53187840).

Almost surely, 2^1220121003 is an apocalyptic number.

1220121003 is a deficient number, since it is larger than the sum of its proper divisors (481889877).

1220121003 is a wasteful number, since it uses less digits than its factorization.

1220121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379.

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

The square root of 1220121003 is about 34930.2305031043. The cubic root of 1220121003 is about 1068.5650555665.

Adding to 1220121003 its reverse (3001210221), we get a palindrome (4221331224).

The spelling of 1220121003 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, three".