21354022020 has 96 divisors (see below), whose sum is σ = 64403619840. Its totient is φ = 5271108480.

The previous prime is 21354021947. The next prime is 21354022021. The reversal of 21354022020 is 2022045312.

It is not an unprimeable number, because it can be changed into a prime (21354022021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206800 + ... + 292359.

It is an arithmetic number, because the mean of its divisors is an integer number (670871040).

Almost surely, 2^21354022020 is an apocalyptic number.

21354022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21354022020 is an abundant number, since it is smaller than the sum of its proper divisors (43049597820).

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

21354022020 is a wasteful number, since it uses less digits than its factorization.

21354022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499225 (or 499223 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21354022020 its reverse (2022045312), we get a palindrome (23376067332).

The spelling of 21354022020 in words is "twenty-one billion, three hundred fifty-four million, twenty-two thousand, twenty".