131121231240221 has 4 divisors (see below), whose sum is σ = 133911044670912. Its totient is φ = 128331417809532.

The previous prime is 131121231240151. The next prime is 131121231240253. The reversal of 131121231240221 is 122042132121131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131121231240221 - 2¹⁰ = 131121231239197 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 (131121231243221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394906715275 + ... + 1394906715368.

It is an arithmetic number, because the mean of its divisors is an integer number (33477761167728).

Almost surely, 2^{131121231240221} is an apocalyptic number.

It is an amenable number.

131121231240221 is a deficient number, since it is larger than the sum of its proper divisors (2789813430691).

131121231240221 is an equidigital number, since it uses as much as digits as its factorization.

131121231240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789813430690.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 131121231240221 its reverse (122042132121131), we get a palindrome (253163363361352).

The spelling of 131121231240221 in words is "one hundred thirty-one trillion, one hundred twenty-one billion, two hundred thirty-one million, two hundred forty thousand, two hundred twenty-one".