1221312332003 has 16 divisors (see below), whose sum is σ = 1249086770400. Its totient is φ = 1193780090880.

The previous prime is 1221312331927. The next prime is 1221312332021. The reversal of 1221312332003 is 3002332131221.

It is a cyclic number.

It is not a de Polignac number, because 1221312332003 - 2³² = 1217017364707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221312332003.

It is not an unprimeable number, because it can be changed into a prime (1221312332083) 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, 23077793 + ... + 23130653.

It is an arithmetic number, because the mean of its divisors is an integer number (78067923150).

Almost surely, 2^{1221312332003} is an apocalyptic number.

1221312332003 is a deficient number, since it is larger than the sum of its proper divisors (27774438397).

1221312332003 is a wasteful number, since it uses less digits than its factorization.

1221312332003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55142.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 1221312332003 its reverse (3002332131221), we get a palindrome (4223644463224).

The spelling of 1221312332003 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred thirty-two thousand, three".