21643034612 has 12 divisors (see below), whose sum is σ = 37933317156. Its totient is φ = 10804944000.

The previous prime is 21643034587. The next prime is 21643034627.

21643034612 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 3880542436 + 17762492176 = 62294^2 + 133276^2 .

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, 4140389 + ... + 4145612.

It is an arithmetic number, because the mean of its divisors is an integer number (3161109763).

Almost surely, 2^21643034612 is an apocalyptic number.

It is an amenable number.

21643034612 is a deficient number, since it is larger than the sum of its proper divisors (16290282544).

21643034612 is a wasteful number, since it uses less digits than its factorization.

21643034612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8286658 (or 8286656 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 21643034612 in words is "twenty-one billion, six hundred forty-three million, thirty-four thousand, six hundred twelve".