133141621 has 4 divisors (see below), whose sum is σ = 137436544. Its totient is φ = 128846700.

The previous prime is 133141517. The next prime is 133141643. The reversal of 133141621 is 126141331.

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: 126141331 = 617 ⋅204443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133141621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133141592 and 133141601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133141691) 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, 2147415 + ... + 2147476.

It is an arithmetic number, because the mean of its divisors is an integer number (34359136).

Almost surely, 2^133141621 is an apocalyptic number.

It is an amenable number.

133141621 is a deficient number, since it is larger than the sum of its proper divisors (4294923).

133141621 is an equidigital number, since it uses as much as digits as its factorization.

133141621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294922.

The product of its digits is 432, while the sum is 22.

The square root of 133141621 is about 11538.7010100791. The cubic root of 133141621 is about 510.6279858670.

Adding to 133141621 its reverse (126141331), we get a palindrome (259282952).

The spelling of 133141621 in words is "one hundred thirty-three million, one hundred forty-one thousand, six hundred twenty-one".