122021011111 has 4 divisors (see below), whose sum is σ = 122026373352. Its totient is φ = 122015648872.

The previous prime is 122021011097. The next prime is 122021011121. The reversal of 122021011111 is 111110120221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122021011111 - 2⁷ = 122021010983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122021011091 and 122021011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122021011121) 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 3 ways as a sum of consecutive naturals, for example, 2646841 + ... + 2692546.

It is an arithmetic number, because the mean of its divisors is an integer number (30506593338).

Almost surely, 2^122021011111 is an apocalyptic number.

122021011111 is a deficient number, since it is larger than the sum of its proper divisors (5362241).

122021011111 is an equidigital number, since it uses as much as digits as its factorization.

122021011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362240.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 122021011111 its reverse (111110120221), we get a palindrome (233131131332).

It can be divided in two parts, 1220210 and 11111, that added together give a palindrome (1231321).

The spelling of 122021011111 in words is "one hundred twenty-two billion, twenty-one million, eleven thousand, one hundred eleven".