21112001012 has 24 divisors (see below), whose sum is σ = 38896431840. Its totient is φ = 9998903520.

The previous prime is 21112000967. The next prime is 21112001033. The reversal of 21112001012 is 21010021112.

It is a junction number, because it is equal to n+sod(n) for n = 21112000984 and 21112001002.

It is a congruent number.

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, 603998 + ... + 637994.

It is an arithmetic number, because the mean of its divisors is an integer number (1620684660).

Almost surely, 2^21112001012 is an apocalyptic number.

It is an amenable number.

21112001012 is a deficient number, since it is larger than the sum of its proper divisors (17784430828).

21112001012 is a wasteful number, since it uses less digits than its factorization.

21112001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42191 (or 42189 counting only the distinct ones).

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

Adding to 21112001012 its reverse (21010021112), we get a palindrome (42122022124).

The spelling of 21112001012 in words is "twenty-one billion, one hundred twelve million, one thousand, twelve".