21342312213 has 16 divisors (see below), whose sum is σ = 29318928576. Its totient is φ = 13799410560.

The previous prime is 21342312197. The next prime is 21342312239. The reversal of 21342312213 is 31221324312.

It is not a de Polignac number, because 21342312213 - 2⁴ = 21342312197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342312293) 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, 272403 + ... + 341888.

It is an arithmetic number, because the mean of its divisors is an integer number (1832433036).

Almost surely, 2^21342312213 is an apocalyptic number.

It is an amenable number.

21342312213 is a deficient number, since it is larger than the sum of its proper divisors (7976616363).

21342312213 is a wasteful number, since it uses less digits than its factorization.

21342312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614644.

The product of its digits is 1728, while the sum is 24.

Adding to 21342312213 its reverse (31221324312), we get a palindrome (52563636525).

The spelling of 21342312213 in words is "twenty-one billion, three hundred forty-two million, three hundred twelve thousand, two hundred thirteen".