21012223133 has 4 divisors (see below), whose sum is σ = 22922425248. Its totient is φ = 19102021020.

The previous prime is 21012223123. The next prime is 21012223163. The reversal of 21012223133 is 33132221012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012223133 - 2⁴ = 21012223117 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 (21012223103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955101041 + ... + 955101062.

It is an arithmetic number, because the mean of its divisors is an integer number (5730606312).

Almost surely, 2^21012223133 is an apocalyptic number.

It is an amenable number.

21012223133 is a deficient number, since it is larger than the sum of its proper divisors (1910202115).

21012223133 is a wasteful number, since it uses less digits than its factorization.

21012223133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910202114.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21012223133 its reverse (33132221012), we get a palindrome (54144444145).

The spelling of 21012223133 in words is "twenty-one billion, twelve million, two hundred twenty-three thousand, one hundred thirty-three".