133072421 has 2 divisors, whose sum is σ = 133072422. Its totient is φ = 133072420.

The previous prime is 133072403. The next prime is 133072439. The reversal of 133072421 is 124270331.

It is a balanced prime because it is at equal distance from previous prime (133072403) and next prime (133072439).

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 9084196 = 11135^2 + 3014^2 .

It is an emirp because it is prime and its reverse (124270331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133072421 - 2¹⁰ = 133071397 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 (133072021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66536210 + 66536211.

It is an arithmetic number, because the mean of its divisors is an integer number (66536211).

Almost surely, 2^133072421 is an apocalyptic number.

It is an amenable number.

133072421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133072421 is an equidigital number, since it uses as much as digits as its factorization.

133072421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 133072421 is about 11535.7020159156. The cubic root of 133072421 is about 510.5395046944.

The spelling of 133072421 in words is "one hundred thirty-three million, seventy-two thousand, four hundred twenty-one".