121604001 has 4 divisors (see below), whose sum is σ = 162138672. Its totient is φ = 81069332.

The previous prime is 121603987. The next prime is 121604029. The reversal of 121604001 is 100406121.

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: 100406121 = 3 ⋅33468707.

It is a cyclic number.

It is not a de Polignac number, because 121604001 - 2⁵ = 121603969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121604081) 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, 20267331 + ... + 20267336.

It is an arithmetic number, because the mean of its divisors is an integer number (40534668).

Almost surely, 2^121604001 is an apocalyptic number.

It is an amenable number.

121604001 is a deficient number, since it is larger than the sum of its proper divisors (40534671).

121604001 is an equidigital number, since it uses as much as digits as its factorization.

121604001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40534670.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 121604001 is about 11027.4204145847. The cubic root of 121604001 is about 495.4303654415.

It can be divided in two parts, 12160 and 4001, that added together give a palindrome (16161).

The spelling of 121604001 in words is "one hundred twenty-one million, six hundred four thousand, one".