21000202111 has 8 divisors (see below), whose sum is σ = 24407015040. Its totient is φ = 17695085208.

The previous prime is 21000202087. The next prime is 21000202133. The reversal of 21000202111 is 11120200012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000202111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000202411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25423561 + ... + 25424386.

It is an arithmetic number, because the mean of its divisors is an integer number (3050876880).

Almost surely, 2^21000202111 is an apocalyptic number.

21000202111 is a deficient number, since it is larger than the sum of its proper divisors (3406812929).

21000202111 is an equidigital number, since it uses as much as digits as its factorization.

21000202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50848013.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000202111 its reverse (11120200012), we get a palindrome (32120402123).

The spelling of 21000202111 in words is "twenty-one billion, two hundred two thousand, one hundred eleven".