21332123021 has 8 divisors (see below), whose sum is σ = 24073869600. Its totient is φ = 18724120240.

The previous prime is 21332123017. The next prime is 21332123047. The reversal of 21332123021 is 12032123312.

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 21332123021 - 2² = 21332123017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21332122984 and 21332123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332123221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33435611 + ... + 33436248.

It is an arithmetic number, because the mean of its divisors is an integer number (3009233700).

Almost surely, 2^21332123021 is an apocalyptic number.

It is an amenable number.

21332123021 is a deficient number, since it is larger than the sum of its proper divisors (2741746579).

21332123021 is a wasteful number, since it uses less digits than its factorization.

21332123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66871899.

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

Adding to 21332123021 its reverse (12032123312), we get a palindrome (33364246333).

The spelling of 21332123021 in words is "twenty-one billion, three hundred thirty-two million, one hundred twenty-three thousand, twenty-one".