133837421 has 2 divisors, whose sum is σ = 133837422. Its totient is φ = 133837420.

The previous prime is 133837411. The next prime is 133837427. The reversal of 133837421 is 124738331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133148521 + 688900 = 11539^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 133837421 - 2¹⁰ = 133836397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133837427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66918710 + 66918711.

It is an arithmetic number, because the mean of its divisors is an integer number (66918711).

Almost surely, 2^133837421 is an apocalyptic number.

It is an amenable number.

133837421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133837421 is an equidigital number, since it uses as much as digits as its factorization.

133837421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 133837421 is about 11568.8124282486. The cubic root of 133837421 is about 511.5159571743.

The spelling of 133837421 in words is "one hundred thirty-three million, eight hundred thirty-seven thousand, four hundred twenty-one".