21244245331 has 4 divisors (see below), whose sum is σ = 21738297592. Its totient is φ = 20750193072.

The previous prime is 21244245299. The next prime is 21244245353. The reversal of 21244245331 is 13354244212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21244245331 - 2⁵ = 21244245299 is a prime.

It is a super-2 number, since 2×21244245331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21244245293 and 21244245302.

It is not an unprimeable number, because it can be changed into a prime (21244245361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247026066 + ... + 247026151.

It is an arithmetic number, because the mean of its divisors is an integer number (5434574398).

Almost surely, 2^21244245331 is an apocalyptic number.

21244245331 is a deficient number, since it is larger than the sum of its proper divisors (494052261).

21244245331 is an equidigital number, since it uses as much as digits as its factorization.

21244245331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494052260.

The product of its digits is 23040, while the sum is 31.

Adding to 21244245331 its reverse (13354244212), we get a palindrome (34598489543).

The spelling of 21244245331 in words is "twenty-one billion, two hundred forty-four million, two hundred forty-five thousand, three hundred thirty-one".