21001021112 has 16 divisors (see below), whose sum is σ = 39380817840. Its totient is φ = 10499469696.

The previous prime is 21001021103. The next prime is 21001021123. The reversal of 21001021112 is 21112010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001021093 and 21001021102.

It is a congruent number.

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, 40748 + ... + 208955.

It is an arithmetic number, because the mean of its divisors is an integer number (2461301115).

Almost surely, 2^21001021112 is an apocalyptic number.

It is an amenable number.

21001021112 is a deficient number, since it is larger than the sum of its proper divisors (18379796728).

21001021112 is a wasteful number, since it uses less digits than its factorization.

21001021112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260222 (or 260218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001021112 its reverse (21112010012), we get a palindrome (42113031124).

The spelling of 21001021112 in words is "twenty-one billion, one million, twenty-one thousand, one hundred twelve".