21074712842 has 8 divisors (see below), whose sum is σ = 31641644100. Its totient is φ = 10527498144.

The previous prime is 21074712839. The next prime is 21074712853. The reversal of 21074712842 is 24821747012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21068812801 + 5900041 = 145151^2 + 2429^2 .

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 = 21074712796 and 21074712805.

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, 4926467 + ... + 4930742.

Almost surely, 2^21074712842 is an apocalyptic number.

21074712842 is a deficient number, since it is larger than the sum of its proper divisors (10566931258).

21074712842 is a wasteful number, since it uses less digits than its factorization.

21074712842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9858280.

The product of its (nonzero) digits is 50176, while the sum is 38.

The spelling of 21074712842 in words is "twenty-one billion, seventy-four million, seven hundred twelve thousand, eight hundred forty-two".