21001100030 has 32 divisors (see below), whose sum is σ = 38085465600. Its totient is φ = 8337595680.

The previous prime is 21001100023. The next prime is 21001100033. The reversal of 21001100030 is 3000110012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21001099990 and 21001100017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001100033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1144871 + ... + 1163069.

It is an arithmetic number, because the mean of its divisors is an integer number (1190170800).

Almost surely, 2^21001100030 is an apocalyptic number.

21001100030 is a deficient number, since it is larger than the sum of its proper divisors (17084365570).

21001100030 is a wasteful number, since it uses less digits than its factorization.

21001100030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19064.

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 21001100030 its reverse (3000110012), we get a palindrome (24001210042).

The spelling of 21001100030 in words is "twenty-one billion, one million, one hundred thousand, thirty".