131231232020221 has 8 divisors (see below), whose sum is σ = 137474882956800. Its totient is φ = 125102143486320.

The previous prime is 131231232020201. The next prime is 131231232020267. The reversal of 131231232020221 is 122020232132131.

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

It is a cyclic number.

It is not a de Polignac number, because 131231232020221 - 2¹³ = 131231232012029 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 (131231232020201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28640598325 + ... + 28640602906.

It is an arithmetic number, because the mean of its divisors is an integer number (17184360369600).

Almost surely, 2^{131231232020221} is an apocalyptic number.

It is an amenable number.

131231232020221 is a deficient number, since it is larger than the sum of its proper divisors (6243650936579).

131231232020221 is an equidigital number, since it uses as much as digits as its factorization.

131231232020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57281201339.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 131231232020221 its reverse (122020232132131), we get a palindrome (253251464152352).

The spelling of 131231232020221 in words is "one hundred thirty-one trillion, two hundred thirty-one billion, two hundred thirty-two million, twenty thousand, two hundred twenty-one".