111221122212021 has 16 divisors (see below), whose sum is σ = 148530314305728. Its totient is φ = 74029739203200.

The previous prime is 111221122211989. The next prime is 111221122212029. The reversal of 111221122212021 is 120212221122111.

It is not a de Polignac number, because 111221122212021 - 2⁵ = 111221122211989 is a prime.

It is a super-2 number, since 2×111221122212021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221122212029) 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, 1673400 + ... + 15008081.

It is an arithmetic number, because the mean of its divisors is an integer number (9283144644108).

Almost surely, 2^{111221122212021} is an apocalyptic number.

It is an amenable number.

111221122212021 is a deficient number, since it is larger than the sum of its proper divisors (37309192093707).

111221122212021 is a wasteful number, since it uses less digits than its factorization.

111221122212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16685012.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111221122212021 its reverse (120212221122111), we get a palindrome (231433343334132).

The spelling of 111221122212021 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".