21002100211 has 4 divisors (see below), whose sum is σ = 21021351624. Its totient is φ = 20982848800.

The previous prime is 21002100199. The next prime is 21002100221. The reversal of 21002100211 is 11200120012.

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 21002100211 - 2¹³ = 21002092019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002100221) 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, 9624070 + ... + 9626251.

It is an arithmetic number, because the mean of its divisors is an integer number (5255337906).

Almost surely, 2^21002100211 is an apocalyptic number.

21002100211 is a deficient number, since it is larger than the sum of its proper divisors (19251413).

21002100211 is a wasteful number, since it uses less digits than its factorization.

21002100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19251412.

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

Adding to 21002100211 its reverse (11200120012), we get a palindrome (32202220223).

The spelling of 21002100211 in words is "twenty-one billion, two million, one hundred thousand, two hundred eleven".