21233111011 has 4 divisors (see below), whose sum is σ = 24266412592. Its totient is φ = 18199809432.

The previous prime is 21233110963. The next prime is 21233111051. The reversal of 21233111011 is 11011133212.

It is a happy number.

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

It is not a de Polignac number, because 21233111011 - 2¹³ = 21233102819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233111051) 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, 1516650780 + ... + 1516650793.

It is an arithmetic number, because the mean of its divisors is an integer number (6066603148).

Almost surely, 2^21233111011 is an apocalyptic number.

21233111011 is a deficient number, since it is larger than the sum of its proper divisors (3033301581).

21233111011 is an equidigital number, since it uses as much as digits as its factorization.

21233111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033301580.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21233111011 its reverse (11011133212), we get a palindrome (32244244223).

The spelling of 21233111011 in words is "twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, eleven".