1200120210021 has 32 divisors (see below), whose sum is σ = 1643711102208. Its totient is φ = 778666106880.

The previous prime is 1200120209999. The next prime is 1200120210073.

1200120210021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1200120210021 - 2⁶ = 1200120209957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200120209979 and 1200120210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120218021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4890741 + ... + 5130261.

It is an arithmetic number, because the mean of its divisors is an integer number (51365971944).

Almost surely, 2^{1200120210021} is an apocalyptic number.

It is an amenable number.

1200120210021 is a deficient number, since it is larger than the sum of its proper divisors (443590892187).

1200120210021 is a wasteful number, since it uses less digits than its factorization.

1200120210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239901.

The product of its (nonzero) digits is 16, while the sum is 12.

It can be divided in two parts, 1200120 and 210021, that added together give a palindrome (1410141).

The spelling of 1200120210021 in words is "one trillion, two hundred billion, one hundred twenty million, two hundred ten thousand, twenty-one".