21011122121122 has 16 divisors (see below), whose sum is σ = 38137835111040. Its totient is φ = 8475074468928.

The previous prime is 21011122121117. The next prime is 21011122121147. The reversal of 21011122121122 is 22112122111012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011122121122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44141012622 + ... + 44141013097.

It is an arithmetic number, because the mean of its divisors is an integer number (2383614694440).

Almost surely, 2^{21011122121122} is an apocalyptic number.

21011122121122 is a deficient number, since it is larger than the sum of its proper divisors (17126712989918).

21011122121122 is a wasteful number, since it uses less digits than its factorization.

21011122121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88282025745.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21011122121122 its reverse (22112122111012), we get a palindrome (43123244232134).

The spelling of 21011122121122 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-two".