1201221132123 has 16 divisors (see below), whose sum is σ = 1608963350400. Its totient is φ = 797147727936.

The previous prime is 1201221132107. The next prime is 1201221132143. The reversal of 1201221132123 is 3212311221021.

It is not a de Polignac number, because 1201221132123 - 2⁴ = 1201221132107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201221132123.

It is not an unprimeable number, because it can be changed into a prime (1201221132143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3845103 + ... + 4145751.

It is an arithmetic number, because the mean of its divisors is an integer number (100560209400).

Almost surely, 2^{1201221132123} is an apocalyptic number.

1201221132123 is a deficient number, since it is larger than the sum of its proper divisors (407742218277).

1201221132123 is a wasteful number, since it uses less digits than its factorization.

1201221132123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306746.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1201221132123 its reverse (3212311221021), we get a palindrome (4413532353144).

The spelling of 1201221132123 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred thirty-two thousand, one hundred twenty-three".