311313031001221 has 4 divisors (see below), whose sum is σ = 311345314846912. Its totient is φ = 311280747155532.

The previous prime is 311313031001173. The next prime is 311313031001233. The reversal of 311313031001221 is 122100130313113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311313031001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311313031001192 and 311313031001201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311313031001521) 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, 16141908381 + ... + 16141927666.

It is an arithmetic number, because the mean of its divisors is an integer number (77836328711728).

Almost surely, 2^{311313031001221} is an apocalyptic number.

It is an amenable number.

311313031001221 is a deficient number, since it is larger than the sum of its proper divisors (32283845691).

311313031001221 is an equidigital number, since it uses as much as digits as its factorization.

311313031001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32283845690.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 311313031001221 its reverse (122100130313113), we get a palindrome (433413161314334).

The spelling of 311313031001221 in words is "three hundred eleven trillion, three hundred thirteen billion, thirty-one million, one thousand, two hundred twenty-one".