131221021203 has 24 divisors (see below), whose sum is σ = 199531874880. Its totient is φ = 82870398000.

The previous prime is 131221021157. The next prime is 131221021223. The reversal of 131221021203 is 302120122131.

It is not a de Polignac number, because 131221021203 - 2⁹ = 131221020691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131221021223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4131100 + ... + 4162742.

It is an arithmetic number, because the mean of its divisors is an integer number (8313828120).

Almost surely, 2^131221021203 is an apocalyptic number.

131221021203 is a deficient number, since it is larger than the sum of its proper divisors (68310853677).

131221021203 is a wasteful number, since it uses less digits than its factorization.

131221021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55919 (or 55916 counting only the distinct ones).

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

Adding to 131221021203 its reverse (302120122131), we get a palindrome (433341143334).

The spelling of 131221021203 in words is "one hundred thirty-one billion, two hundred twenty-one million, twenty-one thousand, two hundred three".