21444234131 has 4 divisors (see below), whose sum is σ = 21533959200. Its totient is φ = 21354509064.

The previous prime is 21444234103. The next prime is 21444234151. The reversal of 21444234131 is 13143244412.

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 21444234131 - 2¹⁴ = 21444217747 is a prime.

It is a super-2 number, since 2×21444234131² (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 = 21444234094 and 21444234103.

It is not an unprimeable number, because it can be changed into a prime (21444234151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44862176 + ... + 44862653.

It is an arithmetic number, because the mean of its divisors is an integer number (5383489800).

Almost surely, 2^21444234131 is an apocalyptic number.

21444234131 is a deficient number, since it is larger than the sum of its proper divisors (89725069).

21444234131 is an equidigital number, since it uses as much as digits as its factorization.

21444234131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89725068.

The product of its digits is 9216, while the sum is 29.

Adding to 21444234131 its reverse (13143244412), we get a palindrome (34587478543).

The spelling of 21444234131 in words is "twenty-one billion, four hundred forty-four million, two hundred thirty-four thousand, one hundred thirty-one".