21120111212102 has 48 divisors (see below), whose sum is σ = 38521367238240. Its totient is φ = 8642928172032.

The previous prime is 21120111212059. The next prime is 21120111212147. The reversal of 21120111212102 is 20121211102112.

It is a super-2 number, since 2×21120111212102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6819077 + ... + 9420192.

It is an arithmetic number, because the mean of its divisors is an integer number (802528484130).

Almost surely, 2^{21120111212102} is an apocalyptic number.

21120111212102 is a deficient number, since it is larger than the sum of its proper divisors (17401256026138).

21120111212102 is a wasteful number, since it uses less digits than its factorization.

21120111212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16239885 (or 16239878 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21120111212102 its reverse (20121211102112), we get a palindrome (41241322314214).

The spelling of 21120111212102 in words is "twenty-one trillion, one hundred twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred two".