1213111333321 has 4 divisors (see below), whose sum is σ = 1213114178500. Its totient is φ = 1213108488144.

The previous prime is 1213111333319. The next prime is 1213111333337. The reversal of 1213111333321 is 1233331113121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1016999639296 + 196111694025 = 1008464^2 + 442845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213111333321 - 2¹ = 1213111333319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213111336321) 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, 639246 + ... + 1683703.

It is an arithmetic number, because the mean of its divisors is an integer number (303278544625).

Almost surely, 2^{1213111333321} is an apocalyptic number.

It is an amenable number.

1213111333321 is a deficient number, since it is larger than the sum of its proper divisors (2845179).

1213111333321 is an equidigital number, since it uses as much as digits as its factorization.

1213111333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845178.

The product of its digits is 972, while the sum is 25.

Adding to 1213111333321 its reverse (1233331113121), we get a palindrome (2446442446442).

The spelling of 1213111333321 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, three hundred thirty-three thousand, three hundred twenty-one".