21030211311 has 4 divisors (see below), whose sum is σ = 28040281752. Its totient is φ = 14020140872.

The previous prime is 21030211297. The next prime is 21030211331. The reversal of 21030211311 is 11311203012.

It is a happy number.

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 21030211311 - 2²⁷ = 20895993583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030211331) 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, 3505035216 + ... + 3505035221.

It is an arithmetic number, because the mean of its divisors is an integer number (7010070438).

Almost surely, 2^21030211311 is an apocalyptic number.

21030211311 is a deficient number, since it is larger than the sum of its proper divisors (7010070441).

21030211311 is an equidigital number, since it uses as much as digits as its factorization.

21030211311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010070440.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21030211311 its reverse (11311203012), we get a palindrome (32341414323).

The spelling of 21030211311 in words is "twenty-one billion, thirty million, two hundred eleven thousand, three hundred eleven".