21393473870 has 8 divisors (see below), whose sum is σ = 38508252984. Its totient is φ = 8557389544.

The previous prime is 21393473819. The next prime is 21393473887. The reversal of 21393473870 is 7837439312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069673684 + ... + 1069673703.

It is an arithmetic number, because the mean of its divisors is an integer number (4813531623).

Almost surely, 2^21393473870 is an apocalyptic number.

21393473870 is a deficient number, since it is larger than the sum of its proper divisors (17114779114).

21393473870 is a wasteful number, since it uses less digits than its factorization.

21393473870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139347394.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 21393473870 in words is "twenty-one billion, three hundred ninety-three million, four hundred seventy-three thousand, eight hundred seventy".