21112121122 has 8 divisors (see below), whose sum is σ = 31669129116. Its totient is φ = 10555744752.

The previous prime is 21112121119. The next prime is 21112121141. The reversal of 21112121122 is 22112121112.

It can be written as a sum of positive squares in 2 ways, for example, as 15366329521 + 5745791601 = 123961^2 + 75801^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is a junction number, because it is equal to n+sod(n) for n = 21112121096 and 21112121105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62913 + ... + 214900.

Almost surely, 2^21112121122 is an apocalyptic number.

21112121122 is a deficient number, since it is larger than the sum of its proper divisors (10557007994).

21112121122 is a wasteful number, since it uses less digits than its factorization.

21112121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315812.

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

Adding to 21112121122 its reverse (22112121112), we get a palindrome (43224242234).

The spelling of 21112121122 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twenty-two".