133661221231 has 2 divisors, whose sum is σ = 133661221232. Its totient is φ = 133661221230.

The previous prime is 133661221219. The next prime is 133661221249. The reversal of 133661221231 is 132122166331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133661221231 is a prime.

It is a super-2 number, since 2×133661221231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133661221193 and 133661221202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133661221931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66830610615 + 66830610616.

It is an arithmetic number, because the mean of its divisors is an integer number (66830610616).

Almost surely, 2^133661221231 is an apocalyptic number.

133661221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

133661221231 is an equidigital number, since it uses as much as digits as its factorization.

133661221231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

Adding to 133661221231 its reverse (132122166331), we get a palindrome (265783387562).

The spelling of 133661221231 in words is "one hundred thirty-three billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred thirty-one".