311012320521 has 16 divisors (see below), whose sum is σ = 474411644928. Its totient is φ = 177538285200.

The previous prime is 311012320499. The next prime is 311012320547. The reversal of 311012320521 is 125023210113.

It is not a de Polignac number, because 311012320521 - 2¹³ = 311012312329 is a prime.

It is a super-2 number, since 2×311012320521² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (311012370521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7605825 + ... + 7646606.

It is an arithmetic number, because the mean of its divisors is an integer number (29650727808).

Almost surely, 2^311012320521 is an apocalyptic number.

It is an amenable number.

311012320521 is a deficient number, since it is larger than the sum of its proper divisors (163399324407).

311012320521 is a wasteful number, since it uses less digits than its factorization.

311012320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15253412.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 311012320521 its reverse (125023210113), we get a palindrome (436035530634).

The spelling of 311012320521 in words is "three hundred eleven billion, twelve million, three hundred twenty thousand, five hundred twenty-one".