1200021045 has 8 divisors (see below), whose sum is σ = 1920033696. Its totient is φ = 640011216.

The previous prime is 1200021013. The next prime is 1200021077. The reversal of 1200021045 is 5401200021.

It is an interprime number because it is at equal distance from previous prime (1200021013) and next prime (1200021077).

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

It is not a de Polignac number, because 1200021045 - 2⁵ = 1200021013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 80001403 = 1200021045 / (1 + 2 + 0 + 0 + 0 + 2 + 1 + 0 + 4 + 5).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40000687 + ... + 40000716.

It is an arithmetic number, because the mean of its divisors is an integer number (240004212).

Almost surely, 2^1200021045 is an apocalyptic number.

1200021045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200021045 is a deficient number, since it is larger than the sum of its proper divisors (720012651).

1200021045 is an equidigital number, since it uses as much as digits as its factorization.

1200021045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80001411.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1200021045 is about 34641.3199084561. The cubic root of 1200021045 is about 1062.6647812712.

Adding to 1200021045 its reverse (5401200021), we get a palindrome (6601221066).

The spelling of 1200021045 in words is "one billion, two hundred million, twenty-one thousand, forty-five".