21043103412 has 12 divisors (see below), whose sum is σ = 49100574656. Its totient is φ = 7014367800.

The previous prime is 21043103399. The next prime is 21043103413. The reversal of 21043103412 is 21430134012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043103413) 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, 876795964 + ... + 876795987.

Almost surely, 2^21043103412 is an apocalyptic number.

It is an amenable number.

21043103412 is an abundant number, since it is smaller than the sum of its proper divisors (28057471244).

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

21043103412 is a wasteful number, since it uses less digits than its factorization.

21043103412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753591958 (or 1753591956 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21043103412 its reverse (21430134012), we get a palindrome (42473237424).

The spelling of 21043103412 in words is "twenty-one billion, forty-three million, one hundred three thousand, four hundred twelve".