121211222001 has 16 divisors (see below), whose sum is σ = 165993576000. Its totient is φ = 78618454848.

The previous prime is 121211221997. The next prime is 121211222023. The reversal of 121211222001 is 100222112121.

It is not a de Polignac number, because 121211222001 - 2² = 121211221997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211222101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2580675 + ... + 2627223.

It is an arithmetic number, because the mean of its divisors is an integer number (10374598500).

Almost surely, 2^121211222001 is an apocalyptic number.

It is an amenable number.

121211222001 is a deficient number, since it is larger than the sum of its proper divisors (44782353999).

121211222001 is a wasteful number, since it uses less digits than its factorization.

121211222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70048.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121211222001 its reverse (100222112121), we get a palindrome (221433334122).

The spelling of 121211222001 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one".