1221200001001 has 8 divisors (see below), whose sum is σ = 1237983100640. Its totient is φ = 1204418369952.

The previous prime is 1221200000983. The next prime is 1221200001011. The reversal of 1221200001001 is 1001000021221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221200001001 - 2³⁵ = 1186840262633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221200001011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363006 + ... + 2073688.

It is an arithmetic number, because the mean of its divisors is an integer number (154747887580).

Almost surely, 2^{1221200001001} is an apocalyptic number.

It is an amenable number.

1221200001001 is a deficient number, since it is larger than the sum of its proper divisors (16783099639).

1221200001001 is an equidigital number, since it uses as much as digits as its factorization.

1221200001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734295.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221200001001 its reverse (1001000021221), we get a palindrome (2222200022222).

The spelling of 1221200001001 in words is "one trillion, two hundred twenty-one billion, two hundred million, one thousand, one".