1221011001201 has 8 divisors (see below), whose sum is σ = 1629241512064. Its totient is φ = 813393912240.

The previous prime is 1221011001187. The next prime is 1221011001211. The reversal of 1221011001201 is 1021001101221.

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

It is not a de Polignac number, because 1221011001201 - 2⁵ = 1221011001169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011001211) 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, 153350830 + ... + 153358791.

It is an arithmetic number, because the mean of its divisors is an integer number (203655189008).

Almost surely, 2^{1221011001201} is an apocalyptic number.

It is an amenable number.

1221011001201 is a deficient number, since it is larger than the sum of its proper divisors (408230510863).

1221011001201 is a wasteful number, since it uses less digits than its factorization.

1221011001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306710951.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221011001201 its reverse (1021001101221), we get a palindrome (2242012102422).

The spelling of 1221011001201 in words is "one trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred one".