1221201201001 has 8 divisors (see below), whose sum is σ = 1235008512000. Its totient is φ = 1207395800160.

The previous prime is 1221201200983. The next prime is 1221201201013. The reversal of 1221201201001 is 1001021021221.

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 1221201201001 - 2⁵ = 1221201200969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221201201091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828400 + ... + 1768798.

It is an arithmetic number, because the mean of its divisors is an integer number (154376064000).

Almost surely, 2^{1221201201001} is an apocalyptic number.

It is an amenable number.

1221201201001 is a deficient number, since it is larger than the sum of its proper divisors (13807310999).

1221201201001 is an equidigital number, since it uses as much as digits as its factorization.

1221201201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955079.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221201201001 its reverse (1001021021221), we get a palindrome (2222222222222).

The spelling of 1221201201001 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred one thousand, one".