21212303103211 has 16 divisors (see below), whose sum is σ = 24504511661568. Its totient is φ = 18147638185600.

The previous prime is 21212303103191. The next prime is 21212303103217. The reversal of 21212303103211 is 11230130321212.

It is not a de Polignac number, because 21212303103211 - 2¹⁹ = 21212302578923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212303103217) 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, 4250335 + ... + 7777528.

It is an arithmetic number, because the mean of its divisors is an integer number (1531531978848).

Almost surely, 2^{21212303103211} is an apocalyptic number.

21212303103211 is a deficient number, since it is larger than the sum of its proper divisors (3292208558357).

21212303103211 is a wasteful number, since it uses less digits than its factorization.

21212303103211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12037322.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21212303103211 its reverse (11230130321212), we get a palindrome (32442433424423).

The spelling of 21212303103211 in words is "twenty-one trillion, two hundred twelve billion, three hundred three million, one hundred three thousand, two hundred eleven".