21444972003 has 144 divisors (see below), whose sum is σ = 40871550720. Its totient is φ = 10521954432.

The previous prime is 21444971957. The next prime is 21444972007. The reversal of 21444972003 is 30027944412.

21444972003 is a `hidden beast` number, since 2 + 1 + 4 + 449 + 7 + 200 + 3 = 666.

It is not a de Polignac number, because 21444972003 - 2¹⁶ = 21444906467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444972007) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 69853176 + ... + 69853482.

Almost surely, 2^21444972003 is an apocalyptic number.

21444972003 is a deficient number, since it is larger than the sum of its proper divisors (19426578717).

21444972003 is a wasteful number, since it uses less digits than its factorization.

21444972003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 21444972003 in words is "twenty-one billion, four hundred forty-four million, nine hundred seventy-two thousand, three".