121540201 has 4 divisors (see below), whose sum is σ = 122615892. Its totient is φ = 120464512.

The previous prime is 121540193. The next prime is 121540213. The reversal of 121540201 is 102045121.

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 20034576 + 101505625 = 4476^2 + 10075^2 .

It is a cyclic number.

It is not a de Polignac number, because 121540201 - 2³ = 121540193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121540241) 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, 537676 + ... + 537901.

It is an arithmetic number, because the mean of its divisors is an integer number (30653973).

Almost surely, 2^121540201 is an apocalyptic number.

It is an amenable number.

121540201 is a deficient number, since it is larger than the sum of its proper divisors (1075691).

121540201 is a wasteful number, since it uses less digits than its factorization.

121540201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075690.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 121540201 is about 11024.5272460999. The cubic root of 121540201 is about 495.3437071449.

Adding to 121540201 its reverse (102045121), we get a palindrome (223585322).

The spelling of 121540201 in words is "one hundred twenty-one million, five hundred forty thousand, two hundred one".