1200021266 has 16 divisors (see below), whose sum is σ = 1907496000. Its totient is φ = 564613488.

The previous prime is 1200021239. The next prime is 1200021269. The reversal of 1200021266 is 6621200021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1200021269) 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, 100310 + ... + 111633.

It is an arithmetic number, because the mean of its divisors is an integer number (119218500).

Almost surely, 2^1200021266 is an apocalyptic number.

1200021266 is a deficient number, since it is larger than the sum of its proper divisors (707474734).

1200021266 is a wasteful number, since it uses less digits than its factorization.

1200021266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212113.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1200021266 is about 34641.3230982883. The cubic root of 1200021266 is about 1062.6648465058.

Adding to 1200021266 its reverse (6621200021), we get a palindrome (7821221287).

The spelling of 1200021266 in words is "one billion, two hundred million, twenty-one thousand, two hundred sixty-six".