21034643012 has 12 divisors (see below), whose sum is σ = 37593830400. Its totient is φ = 10293548616.

The previous prime is 21034642999. The next prime is 21034643017.

21034643012 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×21034643012³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21034643017) 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, 55943012 + ... + 55943387.

It is an arithmetic number, because the mean of its divisors is an integer number (3132819200).

Almost surely, 2^21034643012 is an apocalyptic number.

It is an amenable number.

21034643012 is a deficient number, since it is larger than the sum of its proper divisors (16559187388).

21034643012 is a wasteful number, since it uses less digits than its factorization.

21034643012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111886450 (or 111886448 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 21034643012 in words is "twenty-one billion, thirty-four million, six hundred forty-three thousand, twelve".