1221122001211 has 8 divisors (see below), whose sum is σ = 1396156619264. Its totient is φ = 1046234537640.

The previous prime is 1221122001107. The next prime is 1221122001251. The reversal of 1221122001211 is 1121002211221.

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 1221122001211 - 2⁹ = 1221122000699 is a prime.

It is a super-2 number, since 2×1221122001211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221122001251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36770835 + ... + 36804028.

It is an arithmetic number, because the mean of its divisors is an integer number (174519577408).

Almost surely, 2^{1221122001211} is an apocalyptic number.

1221122001211 is a deficient number, since it is larger than the sum of its proper divisors (175034618053).

1221122001211 is an equidigital number, since it uses as much as digits as its factorization.

1221122001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73577241.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221122001211 its reverse (1121002211221), we get a palindrome (2342124212432).

The spelling of 1221122001211 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one thousand, two hundred eleven".