21112111122 has 16 divisors (see below), whose sum is σ = 42225879072. Its totient is φ = 7037094240.

The previous prime is 21112111121. The next prime is 21112111151. The reversal of 21112111122 is 22111121112.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21112111121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150153 + ... + 254499.

It is an arithmetic number, because the mean of its divisors is an integer number (2639117442).

Almost surely, 2^21112111122 is an apocalyptic number.

21112111122 is an abundant number, since it is smaller than the sum of its proper divisors (21113767950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112111122 is a wasteful number, since it uses less digits than its factorization.

21112111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138073.

The product of its digits is 16, while the sum is 15.

Adding to 21112111122 its reverse (22111121112), we get a palindrome (43223232234).

The spelling of 21112111122 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, one hundred twenty-two".