111212122021 has 32 divisors (see below), whose sum is σ = 152961774336. Its totient is φ = 78041664000.

The previous prime is 111212122003. The next prime is 111212122057. The reversal of 111212122021 is 120221212111.

It is a cyclic number.

It is not a de Polignac number, because 111212122021 - 2⁵ = 111212121989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212121986 and 111212122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212122081) 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, 1313850 + ... + 1395931.

It is an arithmetic number, because the mean of its divisors is an integer number (4780055448).

Almost surely, 2^111212122021 is an apocalyptic number.

111212122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111212122021 is a deficient number, since it is larger than the sum of its proper divisors (41749652315).

111212122021 is a wasteful number, since it uses less digits than its factorization.

111212122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709853.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111212122021 its reverse (120221212111), we get a palindrome (231433334132).

The spelling of 111212122021 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, twenty-one".