21444500642 has 8 divisors (see below), whose sum is σ = 32461859100. Its totient is φ = 10623880944.

The previous prime is 21444500633. The next prime is 21444500647. The reversal of 21444500642 is 24600544412.

It can be written as a sum of positive squares in 2 ways, for example, as 20681028481 + 763472161 = 143809^2 + 27631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21444500599 and 21444500608.

It is not an unprimeable number, because it can be changed into a prime (21444500647) 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, 49184417 + ... + 49184852.

Almost surely, 2^21444500642 is an apocalyptic number.

21444500642 is a deficient number, since it is larger than the sum of its proper divisors (11017358458).

21444500642 is a wasteful number, since it uses less digits than its factorization.

21444500642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98369380.

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 21444500642 in words is "twenty-one billion, four hundred forty-four million, five hundred thousand, six hundred forty-two".