133421401 has 4 divisors (see below), whose sum is σ = 140443600. Its totient is φ = 126399204.

The previous prime is 133421383. The next prime is 133421437. The reversal of 133421401 is 104124331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104124331 = 6121 ⋅17011.

It is a cyclic number.

It is not a de Polignac number, because 133421401 - 2⁵ = 133421369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 7022179 = 133421401 / (1 + 3 + 3 + 4 + 2 + 1 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133421201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511071 + ... + 3511108.

It is an arithmetic number, because the mean of its divisors is an integer number (35110900).

Almost surely, 2^133421401 is an apocalyptic number.

It is an amenable number.

133421401 is a deficient number, since it is larger than the sum of its proper divisors (7022199).

133421401 is an equidigital number, since it uses as much as digits as its factorization.

133421401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022198.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 133421401 is about 11550.8181961279. The cubic root of 133421401 is about 510.9854086466.

Adding to 133421401 its reverse (104124331), we get a palindrome (237545732).

The spelling of 133421401 in words is "one hundred thirty-three million, four hundred twenty-one thousand, four hundred one".