221231012013 has 24 divisors (see below), whose sum is σ = 349098241440. Its totient is φ = 133890248160.

The previous prime is 221231011919. The next prime is 221231012027. The reversal of 221231012013 is 310210132122.

221231012013 is a `hidden beast` number, since 221 + 2 + 310 + 120 + 13 = 666.

It is not a de Polignac number, because 221231012013 - 2¹³ = 221231003821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231012053) 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, 1505731 + ... + 1646112.

It is an arithmetic number, because the mean of its divisors is an integer number (14545760060).

Almost surely, 2^221231012013 is an apocalyptic number.

It is an amenable number.

221231012013 is a deficient number, since it is larger than the sum of its proper divisors (127867229427).

221231012013 is a wasteful number, since it uses less digits than its factorization.

221231012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152569 (or 3152566 counting only the distinct ones).

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

Adding to 221231012013 its reverse (310210132122), we get a palindrome (531441144135).

The spelling of 221231012013 in words is "two hundred twenty-one billion, two hundred thirty-one million, twelve thousand, thirteen".