11211001222221 has 12 divisors (see below), whose sum is σ = 16631335146972. Its totient is φ = 7272000792576.

The previous prime is 11211001222097. The next prime is 11211001222249. The reversal of 11211001222221 is 12222210011211.

11211001222221 is a `hidden beast` number, since 1 + 121 + 100 + 1 + 222 + 221 = 666.

11211001222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6703511304996 + 4507489917225 = 2589114^2 + 2123085^2 .

It is not a de Polignac number, because 11211001222221 - 2¹⁴ = 11211001205837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211001222194 and 11211001222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211501222221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16833334836 + ... + 16833335501.

It is an arithmetic number, because the mean of its divisors is an integer number (1385944595581).

Almost surely, 2^{11211001222221} is an apocalyptic number.

It is an amenable number.

11211001222221 is a deficient number, since it is larger than the sum of its proper divisors (5420333924751).

11211001222221 is a wasteful number, since it uses less digits than its factorization.

11211001222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666670380 (or 33666670377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11211001222221 its reverse (12222210011211), we get a palindrome (23433211233432).

The spelling of 11211001222221 in words is "eleven trillion, two hundred eleven billion, one million, two hundred twenty-two thousand, two hundred twenty-one".