21044628612 has 36 divisors (see below), whose sum is σ = 60795594496. Its totient is φ = 6012750960.

The previous prime is 21044628601. The next prime is 21044628617. The reversal of 21044628612 is 21682644012.

21044628612 is a `hidden beast` number, since 2 + 10 + 4 + 4 + 6 + 28 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21044628617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41754964 + ... + 41755467.

Almost surely, 2^21044628612 is an apocalyptic number.

It is an amenable number.

21044628612 is an abundant number, since it is smaller than the sum of its proper divisors (39750965884).

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

21044628612 is a wasteful number, since it uses less digits than its factorization.

21044628612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83510448 (or 83510443 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 21044628612 in words is "twenty-one billion, forty-four million, six hundred twenty-eight thousand, six hundred twelve".