21033320311 has 4 divisors (see below), whose sum is σ = 21033837000. Its totient is φ = 21032803624.

The previous prime is 21033320281. The next prime is 21033320317. The reversal of 21033320311 is 11302333012.

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 21033320311 - 2¹⁷ = 21033189239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033320317) 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, 191521 + ... + 280618.

It is an arithmetic number, because the mean of its divisors is an integer number (5258459250).

Almost surely, 2^21033320311 is an apocalyptic number.

21033320311 is a deficient number, since it is larger than the sum of its proper divisors (516689).

21033320311 is an equidigital number, since it uses as much as digits as its factorization.

21033320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516688.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21033320311 its reverse (11302333012), we get a palindrome (32335653323).

The spelling of 21033320311 in words is "twenty-one billion, thirty-three million, three hundred twenty thousand, three hundred eleven".