21444528207 has 8 divisors (see below), whose sum is σ = 28694458800. Its totient is φ = 14245474880.

The previous prime is 21444528199. The next prime is 21444528221. The reversal of 21444528207 is 70282544412.

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

It is a cyclic number.

It is not a de Polignac number, because 21444528207 - 2³ = 21444528199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444528227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12718332 + ... + 12720017.

It is an arithmetic number, because the mean of its divisors is an integer number (3586807350).

Almost surely, 2^21444528207 is an apocalyptic number.

21444528207 is a deficient number, since it is larger than the sum of its proper divisors (7249930593).

21444528207 is a wasteful number, since it uses less digits than its factorization.

21444528207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25438633.

The product of its (nonzero) digits is 143360, while the sum is 39.

The spelling of 21444528207 in words is "twenty-one billion, four hundred forty-four million, five hundred twenty-eight thousand, two hundred seven".