1221130232001 has 12 divisors (see below), whose sum is σ = 1768167388260. Its totient is φ = 812096386560.

The previous prime is 1221130231987. The next prime is 1221130232039. The reversal of 1221130232001 is 1002320311221.

It can be written as a sum of positive squares in 2 ways, for example, as 867552530625 + 353577701376 = 931425^2 + 594624^2 .

It is not a de Polignac number, because 1221130232001 - 2⁵ = 1221130231969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221130232051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165865680 + ... + 165873041.

It is an arithmetic number, because the mean of its divisors is an integer number (147347282355).

Almost surely, 2^{1221130232001} is an apocalyptic number.

It is an amenable number.

1221130232001 is a deficient number, since it is larger than the sum of its proper divisors (547037156259).

1221130232001 is a wasteful number, since it uses less digits than its factorization.

1221130232001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331739136 (or 331739133 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221130232001 its reverse (1002320311221), we get a palindrome (2223450543222).

The spelling of 1221130232001 in words is "one trillion, two hundred twenty-one billion, one hundred thirty million, two hundred thirty-two thousand, one".