1321213333331 has 4 divisors (see below), whose sum is σ = 1321224786000. Its totient is φ = 1321201880664.

The previous prime is 1321213333309. The next prime is 1321213333361. The reversal of 1321213333331 is 1333333121231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321213333331 is a prime.

It is a super-2 number, since 2×1321213333331² (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 = 1321213333294 and 1321213333303.

It is not an unprimeable number, because it can be changed into a prime (1321213333361) 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, 5551511 + ... + 5784608.

It is an arithmetic number, because the mean of its divisors is an integer number (330306196500).

Almost surely, 2^{1321213333331} is an apocalyptic number.

1321213333331 is a deficient number, since it is larger than the sum of its proper divisors (11452669).

1321213333331 is a wasteful number, since it uses less digits than its factorization.

1321213333331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11452668.

The product of its digits is 8748, while the sum is 29.

Adding to 1321213333331 its reverse (1333333121231), we get a palindrome (2654546454562).

The spelling of 1321213333331 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, three hundred thirty-three thousand, three hundred thirty-one".