21000000100011 has 4 divisors (see below), whose sum is σ = 28000000133352. Its totient is φ = 14000000066672.

The previous prime is 21000000099989. The next prime is 21000000100141. The reversal of 21000000100011 is 11000100000012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000000100011 - 2⁹ = 21000000099499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000000107011) 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, 3500000016666 + ... + 3500000016671.

It is an arithmetic number, because the mean of its divisors is an integer number (7000000033338).

Almost surely, 2^{21000000100011} is an apocalyptic number.

21000000100011 is a deficient number, since it is larger than the sum of its proper divisors (7000000033341).

21000000100011 is an equidigital number, since it uses as much as digits as its factorization.

21000000100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000000033340.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21000000100011 its reverse (11000100000012), we get a palindrome (32000100100023).

Subtracting from 21000000100011 its reverse (11000100000012), we obtain a palindrome (9999900099999).

The spelling of 21000000100011 in words is "twenty-one trillion, one hundred thousand, eleven".