1201232121 has 32 divisors (see below), whose sum is σ = 1774700928. Its totient is φ = 719447040.

The previous prime is 1201232111. The next prime is 1201232129. The reversal of 1201232121 is 1212321021.

It is not a de Polignac number, because 1201232121 - 2⁹ = 1201231609 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201232121.

It is not an unprimeable number, because it can be changed into a prime (1201232129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94006 + ... + 106016.

It is an arithmetic number, because the mean of its divisors is an integer number (55459404).

Almost surely, 2^1201232121 is an apocalyptic number.

It is an amenable number.

1201232121 is a deficient number, since it is larger than the sum of its proper divisors (573468807).

1201232121 is a wasteful number, since it uses less digits than its factorization.

1201232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121.

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

The square root of 1201232121 is about 34658.7957234524. The cubic root of 1201232121 is about 1063.0221458689.

Adding to 1201232121 its reverse (1212321021), we get a palindrome (2413553142).

Subtracting 1201232121 from its reverse (1212321021), we obtain a square (11088900 = 3330²).

The spelling of 1201232121 in words is "one billion, two hundred one million, two hundred thirty-two thousand, one hundred twenty-one".