131221002130 has 8 divisors (see below), whose sum is σ = 236197803852. Its totient is φ = 52488400848.

The previous prime is 131221002119. The next prime is 131221002137. The reversal of 131221002130 is 31200122131.

It can be written as a sum of positive squares in 2 ways, for example, as 125917812801 + 5303189329 = 354849^2 + 72823^2 .

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

It is not an unprimeable number, because it can be changed into a prime (131221002137) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6561050097 + ... + 6561050116.

Almost surely, 2^131221002130 is an apocalyptic number.

131221002130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221002130 is a deficient number, since it is larger than the sum of its proper divisors (104976801722).

131221002130 is a wasteful number, since it uses less digits than its factorization.

131221002130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13122100220.

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

Adding to 131221002130 its reverse (31200122131), we get a palindrome (162421124261).

The spelling of 131221002130 in words is "one hundred thirty-one billion, two hundred twenty-one million, two thousand, one hundred thirty".