311212203321 has 4 divisors (see below), whose sum is σ = 414949604432. Its totient is φ = 207474802212.

The previous prime is 311212203317. The next prime is 311212203373. The reversal of 311212203321 is 123302212113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123302212113 = 3 ⋅41100737371.

It is not a de Polignac number, because 311212203321 - 2² = 311212203317 is a prime.

It is a super-2 number, since 2×311212203321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311212203311) 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, 51868700551 + ... + 51868700556.

It is an arithmetic number, because the mean of its divisors is an integer number (103737401108).

Almost surely, 2^311212203321 is an apocalyptic number.

It is an amenable number.

311212203321 is a deficient number, since it is larger than the sum of its proper divisors (103737401111).

311212203321 is a wasteful number, since it uses less digits than its factorization.

311212203321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103737401110.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311212203321 its reverse (123302212113), we get a palindrome (434514415434).

The spelling of 311212203321 in words is "three hundred eleven billion, two hundred twelve million, two hundred three thousand, three hundred twenty-one".