21120212133 has 24 divisors (see below), whose sum is σ = 32405380800. Its totient is φ = 13594604688.

The previous prime is 21120212129. The next prime is 21120212159. The reversal of 21120212133 is 33121202112.

It is not a de Polignac number, because 21120212133 - 2² = 21120212129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120212173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442353 + ... + 487766.

It is an arithmetic number, because the mean of its divisors is an integer number (1350224200).

Almost surely, 2^21120212133 is an apocalyptic number.

It is an amenable number.

21120212133 is a deficient number, since it is larger than the sum of its proper divisors (11285168667).

21120212133 is an equidigital number, since it uses as much as digits as its factorization.

21120212133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930186 (or 930151 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21120212133 its reverse (33121202112), we get a palindrome (54241414245).

The spelling of 21120212133 in words is "twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred thirty-three".