133621215 has 64 divisors (see below), whose sum is σ = 268240896. Its totient is φ = 55291392.

The previous prime is 133621211. The next prime is 133621261. The reversal of 133621215 is 512126331.

It is not a de Polignac number, because 133621215 - 2² = 133621211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133621211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71422 + ... + 73268.

It is an arithmetic number, because the mean of its divisors is an integer number (4191264).

Almost surely, 2^133621215 is an apocalyptic number.

133621215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133621215 is an abundant number, since it is smaller than the sum of its proper divisors (134619681).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133621215 is a wasteful number, since it uses less digits than its factorization.

133621215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928.

The product of its digits is 1080, while the sum is 24.

The square root of 133621215 is about 11559.4643041968. The cubic root of 133621215 is about 511.2403680213.

Adding to 133621215 its reverse (512126331), we get a palindrome (645747546).

The spelling of 133621215 in words is "one hundred thirty-three million, six hundred twenty-one thousand, two hundred fifteen".