21023321133 has 16 divisors (see below), whose sum is σ = 29734883136. Its totient is φ = 13166703360.

The previous prime is 21023321129. The next prime is 21023321141. The reversal of 21023321133 is 33112332012.

It is not a de Polignac number, because 21023321133 - 2² = 21023321129 is a prime.

It is a super-2 number, since 2×21023321133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023321113) 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 15 ways as a sum of consecutive naturals, for example, 353391 + ... + 408572.

It is an arithmetic number, because the mean of its divisors is an integer number (1858430196).

Almost surely, 2^21023321133 is an apocalyptic number.

It is an amenable number.

21023321133 is a deficient number, since it is larger than the sum of its proper divisors (8711562003).

21023321133 is a wasteful number, since it uses less digits than its factorization.

21023321133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762524.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21023321133 its reverse (33112332012), we get a palindrome (54135653145).

The spelling of 21023321133 in words is "twenty-one billion, twenty-three million, three hundred twenty-one thousand, one hundred thirty-three".