131220553212 has 144 divisors (see below), whose sum is σ = 397038620160. Its totient is φ = 35727778944.

The previous prime is 131220553199. The next prime is 131220553231. The reversal of 131220553212 is 212355022131.

131220553212 is a `hidden beast` number, since 1 + 3 + 122 + 0 + 5 + 532 + 1 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1517043 + ... + 1601205.

It is an arithmetic number, because the mean of its divisors is an integer number (2757212640).

Almost surely, 2^131220553212 is an apocalyptic number.

131220553212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131220553212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198519310080).

131220553212 is an abundant number, since it is smaller than the sum of its proper divisors (265818066948).

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

131220553212 is a wasteful number, since it uses less digits than its factorization.

131220553212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84472 (or 84467 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 131220553212 its reverse (212355022131), we get a palindrome (343575575343).

The spelling of 131220553212 in words is "one hundred thirty-one billion, two hundred twenty million, five hundred fifty-three thousand, two hundred twelve".