1200021011 has 8 divisors (see below), whose sum is σ = 1371893760. Its totient is φ = 1028258568.

The previous prime is 1200020999. The next prime is 1200021013. The reversal of 1200021011 is 1101200021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200021011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200021011.

It is not an unprimeable number, because it can be changed into a prime (1200021013) 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, 2771 + ... + 49068.

It is an arithmetic number, because the mean of its divisors is an integer number (171486720).

Almost surely, 2^1200021011 is an apocalyptic number.

1200021011 is a deficient number, since it is larger than the sum of its proper divisors (171872749).

1200021011 is an equidigital number, since it uses as much as digits as its factorization.

1200021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55153.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1200021011 is about 34641.3194177127. The cubic root of 1200021011 is about 1062.6647712351.

Adding to 1200021011 its reverse (1101200021), we get a palindrome (2301221032).

The spelling of 1200021011 in words is "one billion, two hundred million, twenty-one thousand, eleven".