131505221204 has 24 divisors (see below), whose sum is σ = 263022247488. Its totient is φ = 56356850880.

The previous prime is 131505221161. The next prime is 131505221209. The reversal of 131505221204 is 402122505131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131505221209) 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, 616247 + ... + 801729.

It is an arithmetic number, because the mean of its divisors is an integer number (10959260312).

Almost surely, 2^131505221204 is an apocalyptic number.

131505221204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

131505221204 is an abundant number, since it is smaller than the sum of its proper divisors (131517026284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131505221204 is a wasteful number, since it uses less digits than its factorization.

131505221204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210815 (or 210813 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 131505221204 its reverse (402122505131), we get a palindrome (533627726335).

The spelling of 131505221204 in words is "one hundred thirty-one billion, five hundred five million, two hundred twenty-one thousand, two hundred four".