1200001220001 has 24 divisors (see below), whose sum is σ = 1819152444096. Its totient is φ = 760794920160.

The previous prime is 1200001219933. The next prime is 1200001220023. The reversal of 1200001220001 is 1000221000021.

It is not a de Polignac number, because 1200001220001 - 2¹¹ = 1200001217953 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 (1200001220101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16718835 + ... + 16790456.

It is an arithmetic number, because the mean of its divisors is an integer number (75798018504).

Almost surely, 2^{1200001220001} is an apocalyptic number.

It is an amenable number.

1200001220001 is a deficient number, since it is larger than the sum of its proper divisors (619151224095).

1200001220001 is a wasteful number, since it uses less digits than its factorization.

1200001220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33509493 (or 33509490 counting only the distinct ones).

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

Adding to 1200001220001 its reverse (1000221000021), we get a palindrome (2200222220022).

The spelling of 1200001220001 in words is "one trillion, two hundred billion, one million, two hundred twenty thousand, one".