1221210001211 has 16 divisors (see below), whose sum is σ = 1240314366720. Its totient is φ = 1202253386400.

The previous prime is 1221210001189. The next prime is 1221210001331. The reversal of 1221210001211 is 1121000121221.

It is a cyclic number.

It is not a de Polignac number, because 1221210001211 - 2⁶ = 1221210001147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221210001511) 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 15 ways as a sum of consecutive naturals, for example, 87957476 + ... + 87971358.

It is an arithmetic number, because the mean of its divisors is an integer number (77519647920).

Almost surely, 2^{1221210001211} is an apocalyptic number.

1221210001211 is a deficient number, since it is larger than the sum of its proper divisors (19104365509).

1221210001211 is a wasteful number, since it uses less digits than its factorization.

1221210001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19106.

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

Adding to 1221210001211 its reverse (1121000121221), we get a palindrome (2342210122432).

The spelling of 1221210001211 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one thousand, two hundred eleven".