21024783834 has 16 divisors (see below), whose sum is σ = 43499553120. Its totient is φ = 6766597040.

The previous prime is 21024783799. The next prime is 21024783839. The reversal of 21024783834 is 43838742012.

It is a happy number.

21024783834 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21024783839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60415872 + ... + 60416219.

It is an arithmetic number, because the mean of its divisors is an integer number (2718722070).

Almost surely, 2^21024783834 is an apocalyptic number.

21024783834 is an abundant number, since it is smaller than the sum of its proper divisors (22474769286).

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

21024783834 is a wasteful number, since it uses less digits than its factorization.

21024783834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120832125.

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 21024783834 in words is "twenty-one billion, twenty-four million, seven hundred eighty-three thousand, eight hundred thirty-four".