1200021212 has 24 divisors (see below), whose sum is σ = 2262532272. Its totient is φ = 553622400.

The previous prime is 1200021187. The next prime is 1200021217. The reversal of 1200021212 is 2121200021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1200021193 and 1200021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200021217) 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, 209912 + ... + 215552.

It is an arithmetic number, because the mean of its divisors is an integer number (94272178).

Almost surely, 2^1200021212 is an apocalyptic number.

It is an amenable number.

1200021212 is a deficient number, since it is larger than the sum of its proper divisors (1062511060).

1200021212 is a wasteful number, since it uses less digits than its factorization.

1200021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9749 (or 9747 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1200021212 is about 34641.3223188723. The cubic root of 1200021212 is about 1062.6648305662.

Adding to 1200021212 its reverse (2121200021), we get a palindrome (3321221233).

It can be divided in two parts, 1200021 and 212, that multiplied together give a palindrome (254404452).

The spelling of 1200021212 in words is "one billion, two hundred million, twenty-one thousand, two hundred twelve".