1200120001011 has 24 divisors (see below), whose sum is σ = 1780471025840. Its totient is φ = 778406884416.

The previous prime is 1200120000973. The next prime is 1200120001027. The reversal of 1200120001011 is 1101000210021.

It is a happy number.

It is not a de Polignac number, because 1200120001011 - 2¹⁰ = 1200119999987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200120000984 and 1200120001002.

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 23 ways as a sum of consecutive naturals, for example, 5572980 + ... + 5784318.

Almost surely, 2^{1200120001011} is an apocalyptic number.

1200120001011 is a deficient number, since it is larger than the sum of its proper divisors (580351024829).

1200120001011 is a wasteful number, since it uses less digits than its factorization.

1200120001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228435 (or 228432 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1200120001011 its reverse (1101000210021), we get a palindrome (2301120211032).

The spelling of 1200120001011 in words is "one trillion, two hundred billion, one hundred twenty million, one thousand, eleven".