21031201211311 has 4 divisors (see below), whose sum is σ = 21031224976800. Its totient is φ = 21031177445824.

The previous prime is 21031201211297. The next prime is 21031201211329. The reversal of 21031201211311 is 11311210213012.

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 21031201211311 - 2²⁷ = 21031066993583 is a prime.

It is a super-2 number, since 2×21031201211311² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031201211351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10501831 + ... + 12343048.

It is an arithmetic number, because the mean of its divisors is an integer number (5257806244200).

Almost surely, 2^{21031201211311} is an apocalyptic number.

21031201211311 is a deficient number, since it is larger than the sum of its proper divisors (23765489).

21031201211311 is an equidigital number, since it uses as much as digits as its factorization.

21031201211311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23765488.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21031201211311 its reverse (11311210213012), we get a palindrome (32342411424323).

The spelling of 21031201211311 in words is "twenty-one trillion, thirty-one billion, two hundred one million, two hundred eleven thousand, three hundred eleven".