133661221241 has 4 divisors (see below), whose sum is σ = 138270228900. Its totient is φ = 129052213584.

The previous prime is 133661221231. The next prime is 133661221249. The reversal of 133661221241 is 142122166331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142122166331 = 83 ⋅1712315257.

It can be written as a sum of positive squares in 2 ways, for example, as 54983215225 + 78678006016 = 234485^2 + 280496^2 .

It is a cyclic number.

It is not a de Polignac number, because 133661221241 - 2¹⁸ = 133660959097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133661221198 and 133661221207.

It is not an unprimeable number, because it can be changed into a prime (133661221249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2304503786 + ... + 2304503843.

It is an arithmetic number, because the mean of its divisors is an integer number (34567557225).

Almost surely, 2^133661221241 is an apocalyptic number.

It is an amenable number.

133661221241 is a deficient number, since it is larger than the sum of its proper divisors (4609007659).

133661221241 is an equidigital number, since it uses as much as digits as its factorization.

133661221241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4609007658.

The product of its digits is 10368, while the sum is 32.

Adding to 133661221241 its reverse (142122166331), we get a palindrome (275783387572).

The spelling of 133661221241 in words is "one hundred thirty-three billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred forty-one".