1221333023131 has 4 divisors (see below), whose sum is σ = 1315281717232. Its totient is φ = 1127384329032.

The previous prime is 1221333023111. The next prime is 1221333023143. The reversal of 1221333023131 is 1313203331221.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1221333023131 is a prime.

It is a super-2 number, since 2×1221333023131² (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 = 1221333023096 and 1221333023105.

It is not an unprimeable number, because it can be changed into a prime (1221333023111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46974347031 + ... + 46974347056.

It is an arithmetic number, because the mean of its divisors is an integer number (328820429308).

Almost surely, 2^{1221333023131} is an apocalyptic number.

1221333023131 is a deficient number, since it is larger than the sum of its proper divisors (93948694101).

1221333023131 is an equidigital number, since it uses as much as digits as its factorization.

1221333023131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93948694100.

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

Adding to 1221333023131 its reverse (1313203331221), we get a palindrome (2534536354352).

The spelling of 1221333023131 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, twenty-three thousand, one hundred thirty-one".