21002030311 has 2 divisors, whose sum is σ = 21002030312. Its totient is φ = 21002030310.

The previous prime is 21002030303. The next prime is 21002030383. The reversal of 21002030311 is 11303020012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002030311 - 2³ = 21002030303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002030291 and 21002030300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002030611) 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, 10501015155 + 10501015156.

It is an arithmetic number, because the mean of its divisors is an integer number (10501015156).

Almost surely, 2^21002030311 is an apocalyptic number.

21002030311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002030311 is an equidigital number, since it uses as much as digits as its factorization.

21002030311 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 13.

Adding to 21002030311 its reverse (11303020012), we get a palindrome (32305050323).

The spelling of 21002030311 in words is "twenty-one billion, two million, thirty thousand, three hundred eleven".