21013122133 has 8 divisors (see below), whose sum is σ = 21404100960. Its totient is φ = 20625747120.

The previous prime is 21013122127. The next prime is 21013122217. The reversal of 21013122133 is 33122131012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013122133 - 2⁵ = 21013122101 is a prime.

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 21013122133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013102133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889183 + ... + 912508.

It is an arithmetic number, because the mean of its divisors is an integer number (2675512620).

Almost surely, 2^21013122133 is an apocalyptic number.

It is an amenable number.

21013122133 is a deficient number, since it is larger than the sum of its proper divisors (390978827).

21013122133 is a wasteful number, since it uses less digits than its factorization.

21013122133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801907.

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

Adding to 21013122133 its reverse (33122131012), we get a palindrome (54135253145).

The spelling of 21013122133 in words is "twenty-one billion, thirteen million, one hundred twenty-two thousand, one hundred thirty-three".