133621005 has 32 divisors (see below), whose sum is σ = 252223488. Its totient is φ = 59112000.

The previous prime is 133621001. The next prime is 133621021. The reversal of 133621005 is 500126331.

It is not a de Polignac number, because 133621005 - 2² = 133621001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133621001) 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 31 ways as a sum of consecutive naturals, for example, 17271 + ... + 23780.

It is an arithmetic number, because the mean of its divisors is an integer number (7881984).

Almost surely, 2^133621005 is an apocalyptic number.

133621005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133621005 is a deficient number, since it is larger than the sum of its proper divisors (118602483).

133621005 is a wasteful number, since it uses less digits than its factorization.

133621005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41097.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 133621005 is about 11559.4552207273. The cubic root of 133621005 is about 511.2401001983.

Adding to 133621005 its reverse (500126331), we get a palindrome (633747336).

The spelling of 133621005 in words is "one hundred thirty-three million, six hundred twenty-one thousand, five".