111121122122021 has 32 divisors (see below), whose sum is σ = 129861625127040. Its totient is φ = 93963437568000.

The previous prime is 111121122121993. The next prime is 111121122122081. The reversal of 111121122122021 is 120221221121111.

It is a happy number.

It is not a de Polignac number, because 111121122122021 - 2³⁰ = 111120048380197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121122121984 and 111121122122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121122122081) 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, 4953245 + ... + 15709133.

It is an arithmetic number, because the mean of its divisors is an integer number (4058175785220).

Almost surely, 2^{111121122122021} is an apocalyptic number.

111121122122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111121122122021 is a deficient number, since it is larger than the sum of its proper divisors (18740503005019).

111121122122021 is a wasteful number, since it uses less digits than its factorization.

111121122122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756565.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111121122122021 its reverse (120221221121111), we get a palindrome (231342343243132).

It can be divided in two parts, 1111211 and 22122021, that added together give a palindrome (23233232).

The spelling of 111121122122021 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, twenty-one".