311001020021 has 2 divisors, whose sum is σ = 311001020022. Its totient is φ = 311001020020.

The previous prime is 311001019991. The next prime is 311001020089. The reversal of 311001020021 is 120020100113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264468490225 + 46532529796 = 514265^2 + 215714^2 .

It is a cyclic number.

It is not a de Polignac number, because 311001020021 - 2⁶ = 311001019957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311001019984 and 311001020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311001020621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155500510010 + 155500510011.

It is an arithmetic number, because the mean of its divisors is an integer number (155500510011).

Almost surely, 2^311001020021 is an apocalyptic number.

It is an amenable number.

311001020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311001020021 is an equidigital number, since it uses as much as digits as its factorization.

311001020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 311001020021 its reverse (120020100113), we get a palindrome (431021120134).

The spelling of 311001020021 in words is "three hundred eleven billion, one million, twenty thousand, twenty-one".