21010310311 has 4 divisors (see below), whose sum is σ = 21734803800. Its totient is φ = 20285816824.

The previous prime is 21010310309. The next prime is 21010310323. The reversal of 21010310311 is 11301301012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21010310311 - 2¹ = 21010310309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010310291 and 21010310300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010316311) 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 in 3 ways as a sum of consecutive naturals, for example, 362246701 + ... + 362246758.

It is an arithmetic number, because the mean of its divisors is an integer number (5433700950).

Almost surely, 2^21010310311 is an apocalyptic number.

21010310311 is a deficient number, since it is larger than the sum of its proper divisors (724493489).

21010310311 is an equidigital number, since it uses as much as digits as its factorization.

21010310311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724493488.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21010310311 its reverse (11301301012), we get a palindrome (32311611323).

It can be divided in two parts, 210 and 10310311, that added together give a square (10310521 = 3211²).

The spelling of 21010310311 in words is "twenty-one billion, ten million, three hundred ten thousand, three hundred eleven".