1201121121231 has 16 divisors (see below), whose sum is σ = 1780680513120. Its totient is φ = 800188597440.

The previous prime is 1201121121209. The next prime is 1201121121257. The reversal of 1201121121231 is 1321211211021.

It is a happy number.

1201121121231 is a `hidden beast` number, since 1 + 201 + 1 + 211 + 21 + 231 = 666.

It is not a de Polignac number, because 1201121121231 - 2¹⁴ = 1201121104847 is a prime.

It is a super-2 number, since 2×1201121121231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201121121131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15483280 + ... + 15560661.

It is an arithmetic number, because the mean of its divisors is an integer number (111292532070).

Almost surely, 2^{1201121121231} is an apocalyptic number.

1201121121231 is a deficient number, since it is larger than the sum of its proper divisors (579559391889).

1201121121231 is a wasteful number, since it uses less digits than its factorization.

1201121121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31045383 (or 31045377 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1201121121231 its reverse (1321211211021), we get a palindrome (2522332332252).

The spelling of 1201121121231 in words is "one trillion, two hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-one".