1221332202123 has 24 divisors (see below), whose sum is σ = 1884148862400. Its totient is φ = 701243365680.

The previous prime is 1221332202113. The next prime is 1221332202151. The reversal of 1221332202123 is 3212022331221.

It is not a de Polignac number, because 1221332202123 - 2¹⁰ = 1221332201099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221332202093 and 1221332202102.

It is not an unprimeable number, because it can be changed into a prime (1221332202113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88533933 + ... + 88547726.

It is an arithmetic number, because the mean of its divisors is an integer number (78506202600).

Almost surely, 2^{1221332202123} is an apocalyptic number.

1221332202123 is a deficient number, since it is larger than the sum of its proper divisors (662816660277).

1221332202123 is a wasteful number, since it uses less digits than its factorization.

1221332202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177081703 (or 177081692 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1221332202123 its reverse (3212022331221), we get a palindrome (4433354533344).

The spelling of 1221332202123 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-two million, two hundred two thousand, one hundred twenty-three".