133543031644621 has 4 divisors (see below), whose sum is σ = 135732261671644. Its totient is φ = 131353801617600.

The previous prime is 133543031644613. The next prime is 133543031644637. The reversal of 133543031644621 is 126446130345331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1297309610025 + 132245722034596 = 1138995^2 + 11499814^2 .

It is a cyclic number.

It is not a de Polignac number, because 133543031644621 - 2³ = 133543031644613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133543031644651) 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, 1094615013420 + ... + 1094615013541.

It is an arithmetic number, because the mean of its divisors is an integer number (33933065417911).

Almost surely, 2^{133543031644621} is an apocalyptic number.

It is an amenable number.

133543031644621 is a deficient number, since it is larger than the sum of its proper divisors (2189230027023).

133543031644621 is an equidigital number, since it uses as much as digits as its factorization.

133543031644621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189230027022.

The product of its (nonzero) digits is 1866240, while the sum is 46.

Adding to 133543031644621 its reverse (126446130345331), we get a palindrome (259989161989952).

The spelling of 133543031644621 in words is "one hundred thirty-three trillion, five hundred forty-three billion, thirty-one million, six hundred forty-four thousand, six hundred twenty-one".