133103521 has 2 divisors, whose sum is σ = 133103522. Its totient is φ = 133103520.

The previous prime is 133103459. The next prime is 133103539. The reversal of 133103521 is 125301331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120143521 + 12960000 = 10961^2 + 3600^2 .

It is an emirp because it is prime and its reverse (125301331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133103521 - 2²³ = 124714913 is a prime.

It is not a weakly prime, because it can be changed into another prime (133103561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66551760 + 66551761.

It is an arithmetic number, because the mean of its divisors is an integer number (66551761).

Almost surely, 2^133103521 is an apocalyptic number.

It is an amenable number.

133103521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133103521 is an equidigital number, since it uses as much as digits as its factorization.

133103521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 133103521 is about 11537.0499262160. The cubic root of 133103521 is about 510.5792738710.

Adding to 133103521 its reverse (125301331), we get a palindrome (258404852).

The spelling of 133103521 in words is "one hundred thirty-three million, one hundred three thousand, five hundred twenty-one".