21312203211 has 48 divisors (see below), whose sum is σ = 34326452160. Its totient is φ = 12651528960.

The previous prime is 21312203203. The next prime is 21312203287. The reversal of 21312203211 is 11230221312.

It is not a de Polignac number, because 21312203211 - 2³ = 21312203203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312203291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5124745 + ... + 5128901.

It is an arithmetic number, because the mean of its divisors is an integer number (715134420).

Almost surely, 2^21312203211 is an apocalyptic number.

21312203211 is a deficient number, since it is larger than the sum of its proper divisors (13014248949).

21312203211 is a wasteful number, since it uses less digits than its factorization.

21312203211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5716 (or 5713 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21312203211 its reverse (11230221312), we get a palindrome (32542424523).

The spelling of 21312203211 in words is "twenty-one billion, three hundred twelve million, two hundred three thousand, two hundred eleven".