21493803446 has 8 divisors (see below), whose sum is σ = 32694799824. Its totient is φ = 10595536840.

The previous prime is 21493803431. The next prime is 21493803467. The reversal of 21493803446 is 64430839412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21493803397 and 21493803406.

It is a congruent number.

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, 75682265 + ... + 75682548.

It is an arithmetic number, because the mean of its divisors is an integer number (4086849978).

Almost surely, 2^21493803446 is an apocalyptic number.

21493803446 is a deficient number, since it is larger than the sum of its proper divisors (11200996378).

21493803446 is a wasteful number, since it uses less digits than its factorization.

21493803446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151364886.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 21493803446 in words is "twenty-one billion, four hundred ninety-three million, eight hundred three thousand, four hundred forty-six".