21493803445 has 8 divisors (see below), whose sum is σ = 25810571736. Its totient is φ = 17183037696.

The previous prime is 21493803431. The next prime is 21493803467. The reversal of 21493803445 is 54430839412.

It can be written as a sum of positive squares in 4 ways, for example, as 13030907409 + 8462896036 = 114153^2 + 91994^2 .

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 21493803445 - 2¹¹ = 21493801397 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, 1492752 + ... + 1507081.

It is an arithmetic number, because the mean of its divisors is an integer number (3226321467).

Almost surely, 2^21493803445 is an apocalyptic number.

It is an amenable number.

21493803445 is a deficient number, since it is larger than the sum of its proper divisors (4316768291).

21493803445 is a wasteful number, since it uses less digits than its factorization.

21493803445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001271.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 21493803445 in words is "twenty-one billion, four hundred ninety-three million, eight hundred three thousand, four hundred forty-five".