11112122021 has 32 divisors (see below), whose sum is σ = 14931130368. Its totient is φ = 7986651840.

The previous prime is 11112121973. The next prime is 11112122057. The reversal of 11112122021 is 12022121111.

It is a cyclic number.

It is not a de Polignac number, because 11112122021 - 2¹⁸ = 11111859877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11112121987 and 11112122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112121021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1625216 + ... + 1632038.

It is an arithmetic number, because the mean of its divisors is an integer number (466597824).

Almost surely, 2^11112122021 is an apocalyptic number.

11112122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11112122021 is a deficient number, since it is larger than the sum of its proper divisors (3819008347).

11112122021 is a wasteful number, since it uses less digits than its factorization.

11112122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8481.

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

Adding to 11112122021 its reverse (12022121111), we get a palindrome (23134243132).

The spelling of 11112122021 in words is "eleven billion, one hundred twelve million, one hundred twenty-two thousand, twenty-one".