21024042012 has 36 divisors (see below), whose sum is σ = 53177200440. Its totient is φ = 7003649952.

The previous prime is 21024042007. The next prime is 21024042029.

21024042012 is a `hidden beast` number, since 2 + 1 + 0 + 240 + 420 + 1 + 2 = 666.

21024042012 is nontrivially palindromic in base 10.

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 (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122962 + ... + 239097.

Almost surely, 2^21024042012 is an apocalyptic number.

It is an amenable number.

21024042012 is an abundant number, since it is smaller than the sum of its proper divisors (32153158428).

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

21024042012 is a wasteful number, since it uses less digits than its factorization.

21024042012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363682 (or 363677 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

It can be divided in two parts, 210240 and 42012, that added together give a palindrome (252252).

The spelling of 21024042012 in words is "twenty-one billion, twenty-four million, forty-two thousand, twelve".