133400421 has 24 divisors (see below), whose sum is σ = 240237504. Its totient is φ = 69298560.

The previous prime is 133400381. The next prime is 133400441. The reversal of 133400421 is 124004331.

It is not a de Polignac number, because 133400421 - 2⁹ = 133399909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133400394 and 133400403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133400441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95556 + ... + 96941.

It is an arithmetic number, because the mean of its divisors is an integer number (10009896).

Almost surely, 2^133400421 is an apocalyptic number.

133400421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133400421 is a deficient number, since it is larger than the sum of its proper divisors (106837083).

133400421 is a wasteful number, since it uses less digits than its factorization.

133400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192521 (or 192518 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 133400421 is about 11549.9099996493. The cubic root of 133400421 is about 510.9586237486.

Adding to 133400421 its reverse (124004331), we get a palindrome (257404752).

It can be divided in two parts, 1334004 and 21, that added together give a square (1334025 = 1155²).

The spelling of 133400421 in words is "one hundred thirty-three million, four hundred thousand, four hundred twenty-one".