131221301020 has 24 divisors (see below), whose sum is σ = 291774423024. Its totient is φ = 49400960256.

The previous prime is 131221300957. The next prime is 131221301041. The reversal of 131221301020 is 20103122131.

131221301020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 131221300985 and 131221301003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192972162 + ... + 192972841.

It is an arithmetic number, because the mean of its divisors is an integer number (12157267626).

Almost surely, 2^131221301020 is an apocalyptic number.

131221301020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131221301020 is an abundant number, since it is smaller than the sum of its proper divisors (160553122004).

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

131221301020 is a wasteful number, since it uses less digits than its factorization.

131221301020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385945029 (or 385945027 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 131221301020 its reverse (20103122131), we get a palindrome (151324423151).

The spelling of 131221301020 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred one thousand, twenty".