1209420239121 has 6 divisors (see below), whose sum is σ = 1746940345410. Its totient is φ = 806280159408.

The previous prime is 1209420239089. The next prime is 1209420239141. The reversal of 1209420239121 is 1219320249021.

1209420239121 is a `hidden beast` number, since 1 + 209 + 42 + 0 + 2 + 391 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 944055140625 + 265365098496 = 971625^2 + 515136^2 .

It is not a de Polignac number, because 1209420239121 - 2⁵ = 1209420239089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1209420239141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67190013276 + ... + 67190013293.

It is an arithmetic number, because the mean of its divisors is an integer number (291156724235).

Almost surely, 2^{1209420239121} is an apocalyptic number.

It is an amenable number.

1209420239121 is a deficient number, since it is larger than the sum of its proper divisors (537520106289).

1209420239121 is a wasteful number, since it uses less digits than its factorization.

1209420239121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134380026575 (or 134380026572 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 1209420239121 in words is "one trillion, two hundred nine billion, four hundred twenty million, two hundred thirty-nine thousand, one hundred twenty-one".