11001001212221 has 16 divisors (see below), whose sum is σ = 11051771597568. Its totient is φ = 10950375321600.

The previous prime is 11001001212211. The next prime is 11001001212269. The reversal of 11001001212221 is 12221210010011.

11001001212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001001212221 is a prime.

It is a super-2 number, since 2×11001001212221² (a number of 27 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 = 11001001212196 and 11001001212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001001212211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375100460 + ... + 375129786.

It is an arithmetic number, because the mean of its divisors is an integer number (690735724848).

Almost surely, 2^{11001001212221} is an apocalyptic number.

It is an amenable number.

11001001212221 is a deficient number, since it is larger than the sum of its proper divisors (50770385347).

11001001212221 is a wasteful number, since it uses less digits than its factorization.

11001001212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31732.

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

Adding to 11001001212221 its reverse (12221210010011), we get a palindrome (23222211222232).

The spelling of 11001001212221 in words is "eleven trillion, one billion, one million, two hundred twelve thousand, two hundred twenty-one".