131221157163 has 8 divisors (see below), whose sum is σ = 174964781376. Its totient is φ = 87479152200.

The previous prime is 131221157161. The next prime is 131221157173. The reversal of 131221157163 is 361751122131.

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

It is not a de Polignac number, because 131221157163 - 2¹ = 131221157161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131221157161) 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, 201073 + ... + 550338.

It is an arithmetic number, because the mean of its divisors is an integer number (21870597672).

Almost surely, 2^131221157163 is an apocalyptic number.

131221157163 is a deficient number, since it is larger than the sum of its proper divisors (43743624213).

131221157163 is an equidigital number, since it uses as much as digits as its factorization.

131221157163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809625.

The product of its digits is 7560, while the sum is 33.

Adding to 131221157163 its reverse (361751122131), we get a palindrome (492972279294).

The spelling of 131221157163 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred fifty-seven thousand, one hundred sixty-three".