20130311021 has 2 divisors, whose sum is σ = 20130311022. Its totient is φ = 20130311020.

The previous prime is 20130311011. The next prime is 20130311041. The reversal of 20130311021 is 12011303102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20033288521 + 97022500 = 141539^2 + 9850^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130311021 - 2¹⁴ = 20130294637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20130310987 and 20130311005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20130311011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065155510 + 10065155511.

It is an arithmetic number, because the mean of its divisors is an integer number (10065155511).

Almost surely, 2^20130311021 is an apocalyptic number.

It is an amenable number.

20130311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130311021 is an equidigital number, since it uses as much as digits as its factorization.

20130311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20130311021 its reverse (12011303102), we get a palindrome (32141614123).

The spelling of 20130311021 in words is "twenty billion, one hundred thirty million, three hundred eleven thousand, twenty-one".