21103543012 has 12 divisors (see below), whose sum is σ = 38122529536. Its totient is φ = 10211391720.

The previous prime is 21103543009. The next prime is 21103543031. The reversal of 21103543012 is 21034530112.

It is a happy 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, 85094808 + ... + 85095055.

Almost surely, 2^21103543012 is an apocalyptic number.

It is an amenable number.

21103543012 is a deficient number, since it is larger than the sum of its proper divisors (17018986524).

21103543012 is a wasteful number, since it uses less digits than its factorization.

21103543012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170189898 (or 170189896 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The spelling of 21103543012 in words is "twenty-one billion, one hundred three million, five hundred forty-three thousand, twelve".