1221210021201 has 8 divisors (see below), whose sum is σ = 1645066420704. Its totient is φ = 805746817920.

The previous prime is 1221210021197. The next prime is 1221210021203. The reversal of 1221210021201 is 1021200121221.

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

It is not a de Polignac number, because 1221210021201 - 2² = 1221210021197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221210021203) 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, 2098298715 + ... + 2098299296.

It is an arithmetic number, because the mean of its divisors is an integer number (205633302588).

Almost surely, 2^{1221210021201} is an apocalyptic number.

It is an amenable number.

1221210021201 is a deficient number, since it is larger than the sum of its proper divisors (423856399503).

1221210021201 is an equidigital number, since it uses as much as digits as its factorization.

1221210021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4196598111.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221210021201 its reverse (1021200121221), we get a palindrome (2242410142422).

The spelling of 1221210021201 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, twenty-one thousand, two hundred one".