221131231013 has 16 divisors (see below), whose sum is σ = 275792117760. Its totient is φ = 172250026800.

The previous prime is 221131231001. The next prime is 221131231127. The reversal of 221131231013 is 310132131122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221131231013 - 2⁶ = 221131230949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131231613) 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, 277073 + ... + 720438.

It is an arithmetic number, because the mean of its divisors is an integer number (17237007360).

Almost surely, 2^221131231013 is an apocalyptic number.

It is an amenable number.

221131231013 is a deficient number, since it is larger than the sum of its proper divisors (54660886747).

221131231013 is a wasteful number, since it uses less digits than its factorization.

221131231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000408.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 221131231013 its reverse (310132131122), we get a palindrome (531263362135).

The spelling of 221131231013 in words is "two hundred twenty-one billion, one hundred thirty-one million, two hundred thirty-one thousand, thirteen".