21201131313 has 24 divisors (see below), whose sum is σ = 31465824000. Its totient is φ = 13745834784.

The previous prime is 21201131279. The next prime is 21201131317. The reversal of 21201131313 is 31313110212.

21201131313 is a `hidden beast` number, since 21 + 201 + 131 + 313 = 666.

It is not a de Polignac number, because 21201131313 - 2⁶ = 21201131249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201131317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 785598 + ... + 812136.

It is an arithmetic number, because the mean of its divisors is an integer number (1311076000).

Almost surely, 2^21201131313 is an apocalyptic number.

It is an amenable number.

21201131313 is a deficient number, since it is larger than the sum of its proper divisors (10264692687).

21201131313 is a wasteful number, since it uses less digits than its factorization.

21201131313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28981 (or 28978 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21201131313 its reverse (31313110212), we get a palindrome (52514241525).

The spelling of 21201131313 in words is "twenty-one billion, two hundred one million, one hundred thirty-one thousand, three hundred thirteen".