133021321 has 2 divisors, whose sum is σ = 133021322. Its totient is φ = 133021320.

The previous prime is 133021271. The next prime is 133021373. The reversal of 133021321 is 123120331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117505600 + 15515721 = 10840^2 + 3939^2 .

It is an emirp because it is prime and its reverse (123120331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133021321 - 2¹⁷ = 132890249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133021295 and 133021304.

It is not a weakly prime, because it can be changed into another prime (133021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66510660 + 66510661.

It is an arithmetic number, because the mean of its divisors is an integer number (66510661).

Almost surely, 2^133021321 is an apocalyptic number.

It is an amenable number.

133021321 is a deficient number, since it is larger than the sum of its proper divisors (1).

133021321 is an equidigital number, since it uses as much as digits as its factorization.

133021321 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 16.

The square root of 133021321 is about 11533.4869402102. The cubic root of 133021321 is about 510.4741470279.

Adding to 133021321 its reverse (123120331), we get a palindrome (256141652).

The spelling of 133021321 in words is "one hundred thirty-three million, twenty-one thousand, three hundred twenty-one".