21112304213 has 72 divisors (see below), whose sum is σ = 29080626624. Its totient is φ = 14994270720.

The previous prime is 21112304197. The next prime is 21112304221. The reversal of 21112304213 is 31240321112.

It is not a de Polignac number, because 21112304213 - 2⁴ = 21112304197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112304113) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11879981 + ... + 11881757.

It is an arithmetic number, because the mean of its divisors is an integer number (403897592).

Almost surely, 2^21112304213 is an apocalyptic number.

It is an amenable number.

21112304213 is a deficient number, since it is larger than the sum of its proper divisors (7968322411).

21112304213 is a wasteful number, since it uses less digits than its factorization.

21112304213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21112304213 its reverse (31240321112), we get a palindrome (52352625325).

The spelling of 21112304213 in words is "twenty-one billion, one hundred twelve million, three hundred four thousand, two hundred thirteen".