133985221 has 2 divisors, whose sum is σ = 133985222. Its totient is φ = 133985220.

The previous prime is 133985197. The next prime is 133985231. The reversal of 133985221 is 122589331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131997121 + 1988100 = 11489^2 + 1410^2 .

It is an emirp because it is prime and its reverse (122589331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133985221 - 2¹³ = 133977029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133985231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66992610 + 66992611.

It is an arithmetic number, because the mean of its divisors is an integer number (66992611).

Almost surely, 2^133985221 is an apocalyptic number.

It is an amenable number.

133985221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133985221 is an equidigital number, since it uses as much as digits as its factorization.

133985221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 133985221 is about 11575.1985296149. The cubic root of 133985221 is about 511.7041811783.

The spelling of 133985221 in words is "one hundred thirty-three million, nine hundred eighty-five thousand, two hundred twenty-one".