21103012012 has 24 divisors (see below), whose sum is σ = 37940735504. Its totient is φ = 10262987712.

The previous prime is 21103011989. The next prime is 21103012019. The reversal of 21103012012 is 21021030112.

It is a junction number, because it is equal to n+sod(n) for n = 21103011983 and 21103012001.

It is not an unprimeable number, because it can be changed into a prime (21103012019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467878 + ... + 510994.

Almost surely, 2^21103012012 is an apocalyptic number.

It is an amenable number.

21103012012 is a deficient number, since it is larger than the sum of its proper divisors (16837723492).

21103012012 is a wasteful number, since it uses less digits than its factorization.

21103012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46465 (or 46463 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21103012012 its reverse (21021030112), we get a palindrome (42124042124).

The spelling of 21103012012 in words is "twenty-one billion, one hundred three million, twelve thousand, twelve".