21042024012 has 72 divisors (see below), whose sum is σ = 56039670960. Its totient is φ = 6638837760.

The previous prime is 21042024011. The next prime is 21042024037.

21042024012 is a `hidden beast` number, since 2 + 1 + 0 + 420 + 240 + 1 + 2 = 666.

21042024012 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21042024012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21042024011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 775312 + ... + 801992.

Almost surely, 2^21042024012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21042024012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28019835480).

21042024012 is an abundant number, since it is smaller than the sum of its proper divisors (34997646948).

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

21042024012 is a wasteful number, since it uses less digits than its factorization.

21042024012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27863 (or 27858 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, 210420 and 24012, that added together give a palindrome (234432).

The spelling of 21042024012 in words is "twenty-one billion, forty-two million, twenty-four thousand, twelve".