131221440411 has 4 divisors (see below), whose sum is σ = 174961920552. Its totient is φ = 87480960272.

The previous prime is 131221440353. The next prime is 131221440431. The reversal of 131221440411 is 114044122131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131221440411 - 2¹³ = 131221432219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131221440431) 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, 21870240066 + ... + 21870240071.

It is an arithmetic number, because the mean of its divisors is an integer number (43740480138).

Almost surely, 2^131221440411 is an apocalyptic number.

131221440411 is a deficient number, since it is larger than the sum of its proper divisors (43740480141).

131221440411 is an equidigital number, since it uses as much as digits as its factorization.

131221440411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43740480140.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 131221440411 its reverse (114044122131), we get a palindrome (245265562542).

The spelling of 131221440411 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred forty thousand, four hundred eleven".