1221231031201 has 16 divisors (see below), whose sum is σ = 1266700032000. Its totient is φ = 1175987736000.

The previous prime is 1221231031187. The next prime is 1221231031213. The reversal of 1221231031201 is 1021301321221.

It is a cyclic number.

It is not a de Polignac number, because 1221231031201 - 2¹¹ = 1221231029153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221231035201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41244400 + ... + 41273998.

It is an arithmetic number, because the mean of its divisors is an integer number (79168752000).

Almost surely, 2^{1221231031201} is an apocalyptic number.

It is an amenable number.

1221231031201 is a deficient number, since it is larger than the sum of its proper divisors (45469000799).

1221231031201 is a wasteful number, since it uses less digits than its factorization.

1221231031201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33360.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221231031201 its reverse (1021301321221), we get a palindrome (2242532352422).

The spelling of 1221231031201 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, thirty-one thousand, two hundred one".