133046821 has 2 divisors, whose sum is σ = 133046822. Its totient is φ = 133046820.

The previous prime is 133046819. The next prime is 133046831. The reversal of 133046821 is 128640331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121220100 + 11826721 = 11010^2 + 3439^2 .

It is an emirp because it is prime and its reverse (128640331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133046821 - 2¹ = 133046819 is a prime.

Together with 133046819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 133046821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133046831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66523410 + 66523411.

It is an arithmetic number, because the mean of its divisors is an integer number (66523411).

Almost surely, 2^133046821 is an apocalyptic number.

133046821 is the 6660-th hex number.

It is an amenable number.

133046821 is a deficient number, since it is larger than the sum of its proper divisors (1).

133046821 is an equidigital number, since it uses as much as digits as its factorization.

133046821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 133046821 is about 11534.5923638419. The cubic root of 133046821 is about 510.5067640022.

The spelling of 133046821 in words is "one hundred thirty-three million, forty-six thousand, eight hundred twenty-one".