21330244121 has 8 divisors (see below), whose sum is σ = 22186399488. Its totient is φ = 20484594000.

The previous prime is 21330244073. The next prime is 21330244153. The reversal of 21330244121 is 12144203312.

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 21330244121 - 2⁶ = 21330244057 is a prime.

It is a super-2 number, since 2×21330244121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21330244921) 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, 2622170 + ... + 2630291.

It is an arithmetic number, because the mean of its divisors is an integer number (2773299936).

Almost surely, 2^21330244121 is an apocalyptic number.

It is an amenable number.

21330244121 is a deficient number, since it is larger than the sum of its proper divisors (856155367).

21330244121 is a wasteful number, since it uses less digits than its factorization.

21330244121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252623.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21330244121 its reverse (12144203312), we get a palindrome (33474447433).

The spelling of 21330244121 in words is "twenty-one billion, three hundred thirty million, two hundred forty-four thousand, one hundred twenty-one".