231321332221 has 16 divisors (see below), whose sum is σ = 290380492800. Its totient is φ = 179672925168.

The previous prime is 231321332201. The next prime is 231321332269. The reversal of 231321332221 is 122233123132.

It is a cyclic number.

It is not a de Polignac number, because 231321332221 - 2¹⁵ = 231321299453 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 (231321332201) 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, 37806901 + ... + 37813018.

It is an arithmetic number, because the mean of its divisors is an integer number (18148780800).

Almost surely, 2^231321332221 is an apocalyptic number.

It is an amenable number.

231321332221 is a deficient number, since it is larger than the sum of its proper divisors (59059160579).

231321332221 is a wasteful number, since it uses less digits than its factorization.

231321332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75619968.

The product of its digits is 2592, while the sum is 25.

Adding to 231321332221 its reverse (122233123132), we get a palindrome (353554455353).

The spelling of 231321332221 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty-one".