231513454221 has 8 divisors (see below), whose sum is σ = 352782406464. Its totient is φ = 132293402400.

The previous prime is 231513454201. The next prime is 231513454247. The reversal of 231513454221 is 122454315132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231513454221 - 2⁶ = 231513454157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231513454201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5512225080 + ... + 5512225121.

It is an arithmetic number, because the mean of its divisors is an integer number (44097800808).

Almost surely, 2^231513454221 is an apocalyptic number.

231513454221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231513454221 is a deficient number, since it is larger than the sum of its proper divisors (121268952243).

231513454221 is a wasteful number, since it uses less digits than its factorization.

231513454221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11024450211.

The product of its digits is 28800, while the sum is 33.

Adding to 231513454221 its reverse (122454315132), we get a palindrome (353967769353).

The spelling of 231513454221 in words is "two hundred thirty-one billion, five hundred thirteen million, four hundred fifty-four thousand, two hundred twenty-one".