21251827445 has 8 divisors (see below), whose sum is σ = 25511307936. Its totient is φ = 16995385296.

The previous prime is 21251827417. The next prime is 21251827459. The reversal of 21251827445 is 54472815212.

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 21251827445 - 2¹² = 21251823349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744167 + ... + 772196.

It is an arithmetic number, because the mean of its divisors is an integer number (3188913492).

Almost surely, 2^21251827445 is an apocalyptic number.

It is an amenable number.

21251827445 is a deficient number, since it is larger than the sum of its proper divisors (4259480491).

21251827445 is a wasteful number, since it uses less digits than its factorization.

21251827445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519171.

The product of its digits is 179200, while the sum is 41.

The spelling of 21251827445 in words is "twenty-one billion, two hundred fifty-one million, eight hundred twenty-seven thousand, four hundred forty-five".