1200021117 has 8 divisors (see below), whose sum is σ = 1610767200. Its totient is φ = 794644560.

The previous prime is 1200021107. The next prime is 1200021149. The reversal of 1200021117 is 7111200021.

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

It is not a de Polignac number, because 1200021117 - 2⁴ = 1200021101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200021096 and 1200021105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200021107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341859 + ... + 1342752.

It is an arithmetic number, because the mean of its divisors is an integer number (201345900).

Almost surely, 2^1200021117 is an apocalyptic number.

It is an amenable number.

1200021117 is a deficient number, since it is larger than the sum of its proper divisors (410746083).

1200021117 is a wasteful number, since it uses less digits than its factorization.

1200021117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684763.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 1200021117 is about 34641.3209476775. The cubic root of 1200021117 is about 1062.6648025241.

Adding to 1200021117 its reverse (7111200021), we get a palindrome (8311221138).

The spelling of 1200021117 in words is "one billion, two hundred million, twenty-one thousand, one hundred seventeen".