21320033021 has 8 divisors (see below), whose sum is σ = 24404371584. Its totient is φ = 18245349360.

The previous prime is 21320032963. The next prime is 21320033027. The reversal of 21320033021 is 12033002312.

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

It is not a de Polignac number, because 21320033021 - 2¹⁴ = 21320016637 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 (21320033027) 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, 2408990 + ... + 2417823.

It is an arithmetic number, because the mean of its divisors is an integer number (3050546448).

Almost surely, 2^21320033021 is an apocalyptic number.

It is an amenable number.

21320033021 is a deficient number, since it is larger than the sum of its proper divisors (3084338563).

21320033021 is an equidigital number, since it uses as much as digits as its factorization.

21320033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827451.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21320033021 its reverse (12033002312), we get a palindrome (33353035333).

The spelling of 21320033021 in words is "twenty-one billion, three hundred twenty million, thirty-three thousand, twenty-one".