131221000133 has 2 divisors, whose sum is σ = 131221000134. Its totient is φ = 131221000132.

The previous prime is 131221000121. The next prime is 131221000213. The reversal of 131221000133 is 331000122131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72056275489 + 59164724644 = 268433^2 + 243238^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221000133 - 2²⁶ = 131153891269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131221000333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610500066 + 65610500067.

It is an arithmetic number, because the mean of its divisors is an integer number (65610500067).

Almost surely, 2^131221000133 is an apocalyptic number.

It is an amenable number.

131221000133 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221000133 is an equidigital number, since it uses as much as digits as its factorization.

131221000133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 131221000133 its reverse (331000122131), we get a palindrome (462221122264).

The spelling of 131221000133 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-three", and thus it is an aban number.