21324245081 has 8 divisors (see below), whose sum is σ = 21379438080. Its totient is φ = 21269124448.

The previous prime is 21324245071. The next prime is 21324245101. The reversal of 21324245081 is 18054242312.

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 21324245081 - 2¹⁰ = 21324244057 is a prime.

It is a super-2 number, since 2×21324245081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324245071) 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, 598880 + ... + 633486.

It is an arithmetic number, because the mean of its divisors is an integer number (2672429760).

Almost surely, 2^21324245081 is an apocalyptic number.

It is an amenable number.

21324245081 is a deficient number, since it is larger than the sum of its proper divisors (55192999).

21324245081 is an equidigital number, since it uses as much as digits as its factorization.

21324245081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36183.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21324245081 its reverse (18054242312), we get a palindrome (39378487393).

The spelling of 21324245081 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty-five thousand, eighty-one".