121201001 has 4 divisors (see below), whose sum is σ = 122562900. Its totient is φ = 119839104.

The previous prime is 121200997. The next prime is 121201037. The reversal of 121201001 is 100102121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69288976 + 51912025 = 8324^2 + 7205^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201001 - 2² = 121200997 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 121201001.

It is not an unprimeable number, because it can be changed into a prime (121201051) 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, 680816 + ... + 680993.

It is an arithmetic number, because the mean of its divisors is an integer number (30640725).

Almost surely, 2^121201001 is an apocalyptic number.

It is an amenable number.

121201001 is a deficient number, since it is larger than the sum of its proper divisors (1361899).

121201001 is an equidigital number, since it uses as much as digits as its factorization.

121201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361898.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 121201001 is about 11009.1326179677. The cubic root of 121201001 is about 494.8824684397.

Adding to 121201001 its reverse (100102121), we get a palindrome (221303122).

The spelling of 121201001 in words is "one hundred twenty-one million, two hundred one thousand, one".