20311001021 has 2 divisors, whose sum is σ = 20311001022. Its totient is φ = 20311001020.

The previous prime is 20311000999. The next prime is 20311001047. The reversal of 20311001021 is 12010011302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11922456100 + 8388544921 = 109190^2 + 91589^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311001021 - 2¹⁰ = 20310999997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20311000993 and 20311001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311006021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155500510 + 10155500511.

It is an arithmetic number, because the mean of its divisors is an integer number (10155500511).

Almost surely, 2^20311001021 is an apocalyptic number.

It is an amenable number.

20311001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311001021 is an equidigital number, since it uses as much as digits as its factorization.

20311001021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20311001021 its reverse (12010011302), we get a palindrome (32321012323).

The spelling of 20311001021 in words is "twenty billion, three hundred eleven million, one thousand, twenty-one".