11211001212121 has 16 divisors (see below), whose sum is σ = 11802030013440. Its totient is φ = 10634691936960.

The previous prime is 11211001212119. The next prime is 11211001212149. The reversal of 11211001212121 is 12121210011211.

It is a cyclic number.

It is not a de Polignac number, because 11211001212121 - 2¹ = 11211001212119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211001212095 and 11211001212104.

It is not an unprimeable number, because it can be changed into a prime (11211001212161) 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, 1435165 + ... + 4947898.

It is an arithmetic number, because the mean of its divisors is an integer number (737626875840).

Almost surely, 2^{11211001212121} is an apocalyptic number.

It is an amenable number.

11211001212121 is a deficient number, since it is larger than the sum of its proper divisors (591028801319).

11211001212121 is a wasteful number, since it uses less digits than its factorization.

11211001212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384216.

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

Adding to 11211001212121 its reverse (12121210011211), we get a palindrome (23332211223332).

The spelling of 11211001212121 in words is "eleven trillion, two hundred eleven billion, one million, two hundred twelve thousand, one hundred twenty-one".