21120231133 has 4 divisors (see below), whose sum is σ = 21182902780. Its totient is φ = 21057559488.

The previous prime is 21120231103. The next prime is 21120231161. The reversal of 21120231133 is 33113202112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9323447364 + 11796783769 = 96558^2 + 108613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120231133 - 2⁵ = 21120231101 is a prime.

It is a super-2 number, since 2×21120231133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120231133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120231103) 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, 31335318 + ... + 31335991.

It is an arithmetic number, because the mean of its divisors is an integer number (5295725695).

Almost surely, 2^21120231133 is an apocalyptic number.

It is an amenable number.

21120231133 is a deficient number, since it is larger than the sum of its proper divisors (62671647).

21120231133 is an equidigital number, since it uses as much as digits as its factorization.

21120231133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62671646.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21120231133 its reverse (33113202112), we get a palindrome (54233433245).

The spelling of 21120231133 in words is "twenty-one billion, one hundred twenty million, two hundred thirty-one thousand, one hundred thirty-three".