21093001018 has 8 divisors (see below), whose sum is σ = 31645961460. Its totient is φ = 10544347200.

The previous prime is 21093001009. The next prime is 21093001019. The reversal of 21093001018 is 81010039012.

It can be written as a sum of positive squares in 2 ways, for example, as 18031924089 + 3061076929 = 134283^2 + 55327^2 .

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 = 21093000983 and 21093001001.

It is not an unprimeable number, because it can be changed into a prime (21093001019) 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, 1064383 + ... + 1084018.

Almost surely, 2^21093001018 is an apocalyptic number.

21093001018 is a deficient number, since it is larger than the sum of its proper divisors (10552960442).

21093001018 is a wasteful number, since it uses less digits than its factorization.

21093001018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153312.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21093001018 in words is "twenty-one billion, ninety-three million, one thousand, eighteen".