1200221001 has 12 divisors (see below), whose sum is σ = 1981317312. Its totient is φ = 685840536.

The previous prime is 1200220951. The next prime is 1200221023. The reversal of 1200221001 is 1001220021.

It is not a de Polignac number, because 1200221001 - 2¹³ = 1200212809 is a prime.

It is a super-3 number, since 3×1200221001³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1200221041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9525501 + ... + 9525626.

It is an arithmetic number, because the mean of its divisors is an integer number (165109776).

Almost surely, 2^1200221001 is an apocalyptic number.

It is an amenable number.

1200221001 is a deficient number, since it is larger than the sum of its proper divisors (781096311).

1200221001 is a wasteful number, since it uses less digits than its factorization.

1200221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19051140 (or 19051137 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200221001 is about 34644.2058791943. The cubic root of 1200221001 is about 1062.7238009023.

Adding to 1200221001 its reverse (1001220021), we get a palindrome (2201441022).

The spelling of 1200221001 in words is "one billion, two hundred million, two hundred twenty-one thousand, one".