1211002000221 has 24 divisors (see below), whose sum is σ = 1764769459680. Its totient is φ = 738267182016.

The previous prime is 1211002000211. The next prime is 1211002000231. The reversal of 1211002000221 is 1220002001121.

It is an interprime number because it is at equal distance from previous prime (1211002000211) and next prime (1211002000231).

It is not a de Polignac number, because 1211002000221 - 2¹⁵ = 1211001967453 is a prime.

It is a super-3 number, since 3×1211002000221³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211002000197 and 1211002000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211002000211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11107266 + ... + 11215763.

It is an arithmetic number, because the mean of its divisors is an integer number (73532060820).

Almost surely, 2^{1211002000221} is an apocalyptic number.

It is an amenable number.

1211002000221 is a deficient number, since it is larger than the sum of its proper divisors (553767459459).

1211002000221 is a wasteful number, since it uses less digits than its factorization.

1211002000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22323165 (or 22323152 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211002000221 its reverse (1220002001121), we get a palindrome (2431004001342).

The spelling of 1211002000221 in words is "one trillion, two hundred eleven billion, two million, two hundred twenty-one", and thus it is an aban number.