11112211110021 has 32 divisors (see below), whose sum is σ = 17572750460160. Its totient is φ = 6111287529984.

The previous prime is 11112211110001. The next prime is 11112211110101. The reversal of 11112211110021 is 12001111221111.

It is not a de Polignac number, because 11112211110021 - 2¹¹ = 11112211107973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112211110001) 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 31 ways as a sum of consecutive naturals, for example, 28957390 + ... + 29338623.

It is an arithmetic number, because the mean of its divisors is an integer number (549148451880).

Almost surely, 2^{11112211110021} is an apocalyptic number.

It is an amenable number.

11112211110021 is a deficient number, since it is larger than the sum of its proper divisors (6460539350139).

11112211110021 is a wasteful number, since it uses less digits than its factorization.

11112211110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58296365.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11112211110021 its reverse (12001111221111), we get a palindrome (23113322331132).

The spelling of 11112211110021 in words is "eleven trillion, one hundred twelve billion, two hundred eleven million, one hundred ten thousand, twenty-one".