131221120302 has 12 divisors (see below), whose sum is σ = 284312427360. Its totient is φ = 43740373428.

The previous prime is 131221120297. The next prime is 131221120309. The reversal of 131221120302 is 203021122131.

131221120302 is a `hidden beast` number, since 131 + 2 + 211 + 20 + 302 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 7290062239 = 131221120302 / (1 + 3 + 1 + 2 + 2 + 1 + 1 + 2 + 0 + 3 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221120309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3645031102 + ... + 3645031137.

It is an arithmetic number, because the mean of its divisors is an integer number (23692702280).

Almost surely, 2^131221120302 is an apocalyptic number.

131221120302 is an abundant number, since it is smaller than the sum of its proper divisors (153091307058).

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

131221120302 is a wasteful number, since it uses less digits than its factorization.

131221120302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290062247 (or 7290062244 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 131221120302 its reverse (203021122131), we get a palindrome (334242242433).

The spelling of 131221120302 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty thousand, three hundred two".