21444302131 has 6 divisors (see below), whose sum is σ = 24945412740. Its totient is φ = 18380830356.

The previous prime is 21444302107. The next prime is 21444302219. The reversal of 21444302131 is 13120344412.

It is not a de Polignac number, because 21444302131 - 2³¹ = 19296818483 is a prime.

It is a super-2 number, since 2×21444302131² (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 = 21444302096 and 21444302105.

It is not an unprimeable number, because it can be changed into a prime (21444302431) 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 5 ways as a sum of consecutive naturals, for example, 218819361 + ... + 218819458.

It is an arithmetic number, because the mean of its divisors is an integer number (4157568790).

Almost surely, 2^21444302131 is an apocalyptic number.

21444302131 is a deficient number, since it is larger than the sum of its proper divisors (3501110609).

21444302131 is an equidigital number, since it uses as much as digits as its factorization.

21444302131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437638833 (or 437638826 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21444302131 its reverse (13120344412), we get a palindrome (34564646543).

The spelling of 21444302131 in words is "twenty-one billion, four hundred forty-four million, three hundred two thousand, one hundred thirty-one".