21311200123213 has 72 divisors (see below), whose sum is σ = 29662985292864. Its totient is φ = 14972248811520.

The previous prime is 21311200123207. The next prime is 21311200123247. The reversal of 21311200123213 is 31232100211312.

It is a de Polignac number, because none of the positive numbers 2^k-21311200123213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311200123253) 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, 4423981 + ... + 7886317.

Almost surely, 2^{21311200123213} is an apocalyptic number.

It is an amenable number.

21311200123213 is a deficient number, since it is larger than the sum of its proper divisors (8351785169651).

21311200123213 is a wasteful number, since it uses less digits than its factorization.

21311200123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462435 (or 3462411 counting only the distinct ones).

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

Adding to 21311200123213 its reverse (31232100211312), we get a palindrome (52543300334525).

The spelling of 21311200123213 in words is "twenty-one trillion, three hundred eleven billion, two hundred million, one hundred twenty-three thousand, two hundred thirteen".