21101018 has 8 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 10210140.

The previous prime is 21100999. The next prime is 21101027. The reversal of 21101018 is 81010112.

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 = 21100993 and 21101011.

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, 170108 + ... + 170231.

It is an arithmetic number, because the mean of its divisors is an integer number (4084080).

Almost surely, 2^21101018 is an apocalyptic number.

21101018 is a deficient number, since it is larger than the sum of its proper divisors (11571622).

21101018 is a wasteful number, since it uses less digits than its factorization.

21101018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340372.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 21101018 is about 4593.5844391934. The cubic root of 21101018 is about 276.3340927284.

The spelling of 21101018 in words is "twenty-one million, one hundred one thousand, eighteen".