21042023020 has 24 divisors (see below), whose sum is σ = 46787557824. Its totient is φ = 7921702656.

The previous prime is 21042022997. The next prime is 21042023021. The reversal of 21042023020 is 2032024012.

It is a junction number, because it is equal to n+sod(n) for n = 21042022985 and 21042023003.

It is not an unprimeable number, because it can be changed into a prime (21042023021) 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, 30943812 + ... + 30944491.

It is an arithmetic number, because the mean of its divisors is an integer number (1949481576).

Almost surely, 2^21042023020 is an apocalyptic number.

21042023020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21042023020 is an abundant number, since it is smaller than the sum of its proper divisors (25745534804).

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

21042023020 is a wasteful number, since it uses less digits than its factorization.

21042023020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61888329 (or 61888327 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21042023020 its reverse (2032024012), we get a palindrome (23074047032).

The spelling of 21042023020 in words is "twenty-one billion, forty-two million, twenty-three thousand, twenty".