21100230012 has 12 divisors (see below), whose sum is σ = 49233870056. Its totient is φ = 7033410000.

The previous prime is 21100229963. The next prime is 21100230029. The reversal of 21100230012 is 21003200112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1758352501 = 21100230012 / (2 + 1 + 1 + 0 + 0 + 2 + 3 + 0 + 0 + 1 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 21100230012.

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, 879176239 + ... + 879176262.

Almost surely, 2^21100230012 is an apocalyptic number.

It is an amenable number.

21100230012 is an abundant number, since it is smaller than the sum of its proper divisors (28133640044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100230012 is a wasteful number, since it uses less digits than its factorization.

21100230012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758352508 (or 1758352506 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21100230012 its reverse (21003200112), we get a palindrome (42103430124).

The spelling of 21100230012 in words is "twenty-one billion, one hundred million, two hundred thirty thousand, twelve".