133021237 has 2 divisors, whose sum is σ = 133021238. Its totient is φ = 133021236.

The previous prime is 133021211. The next prime is 133021249. The reversal of 133021237 is 732120331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109118916 + 23902321 = 10446^2 + 4889^2 .

It is a cyclic number.

It is not a de Polignac number, because 133021237 - 2¹⁵ = 132988469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133021267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66510618 + 66510619.

It is an arithmetic number, because the mean of its divisors is an integer number (66510619).

Almost surely, 2^133021237 is an apocalyptic number.

It is an amenable number.

133021237 is a deficient number, since it is larger than the sum of its proper divisors (1).

133021237 is an equidigital number, since it uses as much as digits as its factorization.

133021237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 133021237 is about 11533.4832986397. The cubic root of 133021237 is about 510.4740395768.

Adding to 133021237 its reverse (732120331), we get a palindrome (865141568).

The spelling of 133021237 in words is "one hundred thirty-three million, twenty-one thousand, two hundred thirty-seven".