1221011021201 has 4 divisors (see below), whose sum is σ = 1226797803504. Its totient is φ = 1215224238900.

The previous prime is 1221011021161. The next prime is 1221011021281. The reversal of 1221011021201 is 1021201101221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221011021201 - 2¹⁴ = 1221011004817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011021281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2893390835 + ... + 2893391256.

It is an arithmetic number, because the mean of its divisors is an integer number (306699450876).

Almost surely, 2^{1221011021201} is an apocalyptic number.

It is an amenable number.

1221011021201 is a deficient number, since it is larger than the sum of its proper divisors (5786782303).

1221011021201 is an equidigital number, since it uses as much as digits as its factorization.

1221011021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5786782302.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221011021201 its reverse (1021201101221), we get a palindrome (2242212122422).

The spelling of 1221011021201 in words is "one trillion, two hundred twenty-one billion, eleven million, twenty-one thousand, two hundred one".