21133120111 has 4 divisors (see below), whose sum is σ = 21139502272. Its totient is φ = 21126737952.

The previous prime is 21133120097. The next prime is 21133120117. The reversal of 21133120111 is 11102133112.

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 21133120111 - 2⁵ = 21133120079 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 (21133120117) 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, 3186111 + ... + 3192736.

It is an arithmetic number, because the mean of its divisors is an integer number (5284875568).

Almost surely, 2^21133120111 is an apocalyptic number.

21133120111 is a deficient number, since it is larger than the sum of its proper divisors (6382161).

21133120111 is an equidigital number, since it uses as much as digits as its factorization.

21133120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6382160.

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

Adding to 21133120111 its reverse (11102133112), we get a palindrome (32235253223).

The spelling of 21133120111 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty thousand, one hundred eleven".