21493477846 has 8 divisors (see below), whose sum is σ = 32989989384. Its totient is φ = 10496814720.

The previous prime is 21493477823. The next prime is 21493477849. The reversal of 21493477846 is 64877439412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493477849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124961995 + ... + 124962166.

It is an arithmetic number, because the mean of its divisors is an integer number (4123748673).

Almost surely, 2^21493477846 is an apocalyptic number.

21493477846 is a deficient number, since it is larger than the sum of its proper divisors (11496511538).

21493477846 is a wasteful number, since it uses less digits than its factorization.

21493477846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249924206.

The product of its digits is 8128512, while the sum is 55.

The spelling of 21493477846 in words is "twenty-one billion, four hundred ninety-three million, four hundred seventy-seven thousand, eight hundred forty-six".