133870621 has 4 divisors (see below), whose sum is σ = 133920000. Its totient is φ = 133821244.

The previous prime is 133870619. The next prime is 133870651. The reversal of 133870621 is 126078331.

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: 126078331 = 8501 ⋅14831.

It is a cyclic number.

It is not a de Polignac number, because 133870621 - 2¹ = 133870619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133870601) 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 3 ways as a sum of consecutive naturals, for example, 20371 + ... + 26128.

It is an arithmetic number, because the mean of its divisors is an integer number (33480000).

Almost surely, 2^133870621 is an apocalyptic number.

It is an amenable number.

133870621 is a deficient number, since it is larger than the sum of its proper divisors (49379).

133870621 is an equidigital number, since it uses as much as digits as its factorization.

133870621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49378.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 133870621 is about 11570.2472315850. The cubic root of 133870621 is about 511.5582495955.

The spelling of 133870621 in words is "one hundred thirty-three million, eight hundred seventy thousand, six hundred twenty-one".