21124478798 has 8 divisors (see below), whose sum is σ = 31697841000. Its totient is φ = 10558531800.

The previous prime is 21124478789. The next prime is 21124478821. The reversal of 21124478798 is 89787442112.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1846673 + ... + 1858076.

It is an arithmetic number, because the mean of its divisors is an integer number (3962230125).

Almost surely, 2^21124478798 is an apocalyptic number.

21124478798 is a deficient number, since it is larger than the sum of its proper divisors (10573362202).

21124478798 is a wasteful number, since it uses less digits than its factorization.

21124478798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707602.

The product of its digits is 1806336, while the sum is 53.

The spelling of 21124478798 in words is "twenty-one billion, one hundred twenty-four million, four hundred seventy-eight thousand, seven hundred ninety-eight".