1221333203131 has 16 divisors (see below), whose sum is σ = 1285482938400. Its totient is φ = 1158815040768.

The previous prime is 1221333203113. The next prime is 1221333203203. The reversal of 1221333203131 is 1313023331221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221333203131 is a prime.

It is a super-2 number, since 2×1221333203131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221333203096 and 1221333203105.

It is not an unprimeable number, because it can be changed into a prime (1221333201131) 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, 1030836 + ... + 1872241.

It is an arithmetic number, because the mean of its divisors is an integer number (80342683650).

Almost surely, 2^{1221333203131} is an apocalyptic number.

1221333203131 is a deficient number, since it is larger than the sum of its proper divisors (64149735269).

1221333203131 is a wasteful number, since it uses less digits than its factorization.

1221333203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903358.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221333203131 its reverse (1313023331221), we get a palindrome (2534356534352).

The spelling of 1221333203131 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, two hundred three thousand, one hundred thirty-one".