21111012122 has 8 divisors (see below), whose sum is σ = 31980048372. Its totient is φ = 10450996000.

The previous prime is 21111012071. The next prime is 21111012163. The reversal of 21111012122 is 22121011112.

It can be written as a sum of positive squares in 2 ways, for example, as 21051398281 + 59613841 = 145091^2 + 7721^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21111012097 and 21111012106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52254779 + ... + 52255182.

Almost surely, 2^21111012122 is an apocalyptic number.

21111012122 is a deficient number, since it is larger than the sum of its proper divisors (10869036250).

21111012122 is a wasteful number, since it uses less digits than its factorization.

21111012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104510064.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111012122 its reverse (22121011112), we get a palindrome (43232023234).

The spelling of 21111012122 in words is "twenty-one billion, one hundred eleven million, twelve thousand, one hundred twenty-two".