21330030021 has 8 divisors (see below), whose sum is σ = 29936884320. Its totient is φ = 13471597872.

The previous prime is 21330029939. The next prime is 21330030023. The reversal of 21330030021 is 12003003312.

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

It is not a de Polignac number, because 21330030021 - 2⁹ = 21330029509 is a prime.

It is a super-2 number, since 2×21330030021² (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 (21330030023) 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, 187105470 + ... + 187105583.

It is an arithmetic number, because the mean of its divisors is an integer number (3742110540).

Almost surely, 2^21330030021 is an apocalyptic number.

It is an amenable number.

21330030021 is a deficient number, since it is larger than the sum of its proper divisors (8606854299).

21330030021 is a wasteful number, since it uses less digits than its factorization.

21330030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374211075.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21330030021 its reverse (12003003312), we get a palindrome (33333033333).

The spelling of 21330030021 in words is "twenty-one billion, three hundred thirty million, thirty thousand, twenty-one".