133455421 has 4 divisors (see below), whose sum is σ = 145587744. Its totient is φ = 121323100.

The previous prime is 133455409. The next prime is 133455467. The reversal of 133455421 is 124554331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133455421 - 2¹¹ = 133453373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133455421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133455401) 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, 6066145 + ... + 6066166.

It is an arithmetic number, because the mean of its divisors is an integer number (36396936).

Almost surely, 2^133455421 is an apocalyptic number.

133455421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133455421 is a deficient number, since it is larger than the sum of its proper divisors (12132323).

133455421 is a wasteful number, since it uses less digits than its factorization.

133455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12132322.

The product of its digits is 7200, while the sum is 28.

The square root of 133455421 is about 11552.2907252198. The cubic root of 133455421 is about 511.0288355785.

It can be divided in two parts, 133 and 455421, that added together give a palindrome (455554).

The spelling of 133455421 in words is "one hundred thirty-three million, four hundred fifty-five thousand, four hundred twenty-one".