1221002001211 has 8 divisors (see below), whose sum is σ = 1251786324800. Its totient is φ = 1190326265352.

The previous prime is 1221002001181. The next prime is 1221002001217. The reversal of 1221002001211 is 1121002001221.

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 1221002001211 - 2³⁷ = 1083563047739 is a prime.

It is a super-2 number, since 2×1221002001211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221002001191 and 1221002001200.

It is not an unprimeable number, because it can be changed into a prime (1221002001217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27124161 + ... + 27169138.

It is an arithmetic number, because the mean of its divisors is an integer number (156473290600).

Almost surely, 2^{1221002001211} is an apocalyptic number.

1221002001211 is a deficient number, since it is larger than the sum of its proper divisors (30784323589).

1221002001211 is an equidigital number, since it uses as much as digits as its factorization.

1221002001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54293865.

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

Adding to 1221002001211 its reverse (1121002001221), we get a palindrome (2342004002432).

The spelling of 1221002001211 in words is "one trillion, two hundred twenty-one billion, two million, one thousand, two hundred eleven".