1200221000 has 64 divisors (see below), whose sum is σ = 3063864960. Its totient is φ = 436440000.

The previous prime is 1200220951. The next prime is 1200221023. The reversal of 1200221000 is 1220021.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43556 + ... + 65555.

It is an arithmetic number, because the mean of its divisors is an integer number (47872890).

Almost surely, 2^1200221000 is an apocalyptic number.

1200221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200221000 is an abundant number, since it is smaller than the sum of its proper divisors (1863643960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200221000 is a wasteful number, since it uses less digits than its factorization.

1200221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109143 (or 109129 counting only the distinct ones).

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

The square root of 1200221000 is about 34644.2058647619. The cubic root of 1200221000 is about 1062.7238006071.

Adding to 1200221000 its reverse (1220021), we get a palindrome (1201441021).

The spelling of 1200221000 in words is "one billion, two hundred million, two hundred twenty-one thousand".