21103003211 has 4 divisors (see below), whose sum is σ = 21111758424. Its totient is φ = 21094248000.

The previous prime is 21103003189. The next prime is 21103003279. The reversal of 21103003211 is 11230030112.

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 21103003211 - 2¹⁰ = 21103002187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103003291) 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, 4373990 + ... + 4378811.

It is an arithmetic number, because the mean of its divisors is an integer number (5277939606).

Almost surely, 2^21103003211 is an apocalyptic number.

21103003211 is a deficient number, since it is larger than the sum of its proper divisors (8755213).

21103003211 is an equidigital number, since it uses as much as digits as its factorization.

21103003211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8755212.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21103003211 its reverse (11230030112), we get a palindrome (32333033323).

The spelling of 21103003211 in words is "twenty-one billion, one hundred three million, three thousand, two hundred eleven".