131221212203 has 2 divisors, whose sum is σ = 131221212204. Its totient is φ = 131221212202.

The previous prime is 131221212181. The next prime is 131221212209. The reversal of 131221212203 is 302212122131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131221212203 - 2¹⁸ = 131220950059 is a prime.

It is a super-2 number, since 2×131221212203² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131221212209) 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 as a sum of consecutive naturals, namely, 65610606101 + 65610606102.

It is an arithmetic number, because the mean of its divisors is an integer number (65610606102).

Almost surely, 2^131221212203 is an apocalyptic number.

131221212203 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221212203 is an equidigital number, since it uses as much as digits as its factorization.

131221212203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131221212203 its reverse (302212122131), we get a palindrome (433433334334).

The spelling of 131221212203 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred three".