21248947378 has 8 divisors (see below), whose sum is σ = 31900830768. Its totient is φ = 10615337124.

The previous prime is 21248947297. The next prime is 21248947387. The reversal of 21248947378 is 87374984212.

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

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, 4565376 + ... + 4570027.

It is an arithmetic number, because the mean of its divisors is an integer number (3987603846).

Almost surely, 2^21248947378 is an apocalyptic number.

21248947378 is a deficient number, since it is larger than the sum of its proper divisors (10651883390).

21248947378 is a wasteful number, since it uses less digits than its factorization.

21248947378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9136568.

The product of its digits is 5419008, while the sum is 55.

The spelling of 21248947378 in words is "twenty-one billion, two hundred forty-eight million, nine hundred forty-seven thousand, three hundred seventy-eight".