21244241331 has 16 divisors (see below), whose sum is σ = 31497268000. Its totient is φ = 14151884544.

The previous prime is 21244241327. The next prime is 21244241351. The reversal of 21244241331 is 13314244212.

21244241331 is a `hidden beast` number, since 2 + 1 + 244 + 2 + 413 + 3 + 1 = 666.

It is not a de Polignac number, because 21244241331 - 2² = 21244241327 is a prime.

It is a super-2 number, since 2×21244241331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21244241295 and 21244241304.

It is not an unprimeable number, because it can be changed into a prime (21244241351) 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 15 ways as a sum of consecutive naturals, for example, 268306 + ... + 338343.

It is an arithmetic number, because the mean of its divisors is an integer number (1968579250).

Almost surely, 2^21244241331 is an apocalyptic number.

21244241331 is a deficient number, since it is larger than the sum of its proper divisors (10253026669).

21244241331 is a wasteful number, since it uses less digits than its factorization.

21244241331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607955 (or 607949 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21244241331 its reverse (13314244212), we get a palindrome (34558485543).

The spelling of 21244241331 in words is "twenty-one billion, two hundred forty-four million, two hundred forty-one thousand, three hundred thirty-one".