311100220021 has 2 divisors, whose sum is σ = 311100220022. Its totient is φ = 311100220020.

The previous prime is 311100220007. The next prime is 311100220097. The reversal of 311100220021 is 120022001113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255762832900 + 55337387121 = 505730^2 + 235239^2 .

It is a cyclic number.

It is not a de Polignac number, because 311100220021 - 2¹¹ = 311100217973 is a prime.

It is a super-2 number, since 2×311100220021² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311100219983 and 311100220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311100290021) 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 as a sum of consecutive naturals, namely, 155550110010 + 155550110011.

It is an arithmetic number, because the mean of its divisors is an integer number (155550110011).

Almost surely, 2^311100220021 is an apocalyptic number.

It is an amenable number.

311100220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311100220021 is an equidigital number, since it uses as much as digits as its factorization.

311100220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 311100220021 its reverse (120022001113), we get a palindrome (431122221134).

The spelling of 311100220021 in words is "three hundred eleven billion, one hundred million, two hundred twenty thousand, twenty-one".