21021103120112 has 20 divisors (see below), whose sum is σ = 40787328542856. Its totient is φ = 10495340915520.

The previous prime is 21021103120111. The next prime is 21021103120201. The reversal of 21021103120112 is 21102130112012.

It is a happy number.

It is a super-2 number, since 2×21021103120112² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021103120111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950653883 + ... + 950675994.

Almost surely, 2^{21021103120112} is an apocalyptic number.

It is an amenable number.

21021103120112 is a deficient number, since it is larger than the sum of its proper divisors (19766225422744).

21021103120112 is a wasteful number, since it uses less digits than its factorization.

21021103120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901330576 (or 1901330570 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21021103120112 its reverse (21102130112012), we get a palindrome (42123233232124).

The spelling of 21021103120112 in words is "twenty-one trillion, twenty-one billion, one hundred three million, one hundred twenty thousand, one hundred twelve".