133601421 has 4 divisors (see below), whose sum is σ = 178135232. Its totient is φ = 89067612.

The previous prime is 133601399. The next prime is 133601423. The reversal of 133601421 is 124106331.

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.

It is not a de Polignac number, because 133601421 - 2⁶ = 133601357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133601423) 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, 22266901 + ... + 22266906.

It is an arithmetic number, because the mean of its divisors is an integer number (44533808).

Almost surely, 2^133601421 is an apocalyptic number.

It is an amenable number.

133601421 is a deficient number, since it is larger than the sum of its proper divisors (44533811).

133601421 is an equidigital number, since it uses as much as digits as its factorization.

133601421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44533810.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 133601421 is about 11558.6080909424. The cubic root of 133601421 is about 511.2151225502.

Adding to 133601421 its reverse (124106331), we get a palindrome (257707752).

The spelling of 133601421 in words is "one hundred thirty-three million, six hundred one thousand, four hundred twenty-one".