1200221000001 has 12 divisors (see below), whose sum is σ = 1733826519828. Its totient is φ = 800067042144.

The previous prime is 1200220999973. The next prime is 1200221000021. The reversal of 1200221000001 is 1000001220021.

It can be written as a sum of positive squares in 2 ways, for example, as 648023390001 + 552197610000 = 804999^2 + 743100^2 .

It is not a de Polignac number, because 1200221000001 - 2¹⁴ = 1200220983617 is a prime.

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 (1200221000021) 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, 6596190 + ... + 6775703.

It is an arithmetic number, because the mean of its divisors is an integer number (144485543319).

Almost surely, 2^{1200221000001} is an apocalyptic number.

It is an amenable number.

1200221000001 is a deficient number, since it is larger than the sum of its proper divisors (533605519827).

1200221000001 is a wasteful number, since it uses less digits than its factorization.

1200221000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13381872 (or 13381869 counting only the distinct ones).

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

Adding to 1200221000001 its reverse (1000001220021), we get a palindrome (2200222220022).

The spelling of 1200221000001 in words is "one trillion, two hundred billion, two hundred twenty-one million, one", and thus it is an aban number.