21444002002 has 8 divisors (see below), whose sum is σ = 32167096956. Its totient is φ = 10721636352.

The previous prime is 21444001981. The next prime is 21444002029. The reversal of 21444002002 is 20020044412.

It can be written as a sum of positive squares in 2 ways, for example, as 19636136641 + 1807865361 = 140129^2 + 42519^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101683 + ... + 230710.

Almost surely, 2^21444002002 is an apocalyptic number.

21444002002 is a deficient number, since it is larger than the sum of its proper divisors (10723094954).

21444002002 is a wasteful number, since it uses less digits than its factorization.

21444002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364652.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21444002002 its reverse (20020044412), we get a palindrome (41464046414).

The spelling of 21444002002 in words is "twenty-one billion, four hundred forty-four million, two thousand, two".