121121601 has 4 divisors (see below), whose sum is σ = 161495472. Its totient is φ = 80747732.

The previous prime is 121121597. The next prime is 121121633. The reversal of 121121601 is 106121121.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 121121601 - 2² = 121121597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121121641) 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, 20186931 + ... + 20186936.

It is an arithmetic number, because the mean of its divisors is an integer number (40373868).

Almost surely, 2^121121601 is an apocalyptic number.

It is an amenable number.

121121601 is a deficient number, since it is larger than the sum of its proper divisors (40373871).

121121601 is an equidigital number, since it uses as much as digits as its factorization.

121121601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40373870.

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 121121601 is about 11005.5259301862. The cubic root of 121121601 is about 494.7743773311.

Adding to 121121601 its reverse (106121121), we get a palindrome (227242722).

The spelling of 121121601 in words is "one hundred twenty-one million, one hundred twenty-one thousand, six hundred one".