21011201018 has 8 divisors (see below), whose sum is σ = 32533472640. Its totient is φ = 10166710140.

The previous prime is 21011201011. The next prime is 21011201027. The reversal of 21011201018 is 81010211012.

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 = 21011200987 and 21011201005.

It is not an unprimeable number, because it can be changed into a prime (21011201011) 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, 169445108 + ... + 169445231.

It is an arithmetic number, because the mean of its divisors is an integer number (4066684080).

Almost surely, 2^21011201018 is an apocalyptic number.

21011201018 is a deficient number, since it is larger than the sum of its proper divisors (11522271622).

21011201018 is a wasteful number, since it uses less digits than its factorization.

21011201018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338890372.

The product of its (nonzero) digits is 32, while the sum is 17.

The spelling of 21011201018 in words is "twenty-one billion, eleven million, two hundred one thousand, eighteen".