1200120001001 has 8 divisors (see below), whose sum is σ = 1263314457600. Its totient is φ = 1136928569040.

The previous prime is 1200120000973. The next prime is 1200120001027. The reversal of 1200120001001 is 1001000210021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200120001001 - 2²² = 1200115806697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200120001001.

It is not an unprimeable number, because it can be changed into a prime (1200120001061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82136 + ... + 1551446.

It is an arithmetic number, because the mean of its divisors is an integer number (157914307200).

Almost surely, 2^{1200120001001} is an apocalyptic number.

It is an amenable number.

1200120001001 is a deficient number, since it is larger than the sum of its proper divisors (63194456599).

1200120001001 is a wasteful number, since it uses less digits than its factorization.

1200120001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512319.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1200120001001 its reverse (1001000210021), we get a palindrome (2201120211022).

The spelling of 1200120001001 in words is "one trillion, two hundred billion, one hundred twenty million, one thousand, one".