21020341420 has 24 divisors (see below), whose sum is σ = 47538311184. Its totient is φ = 7761356736.

The previous prime is 21020341417. The next prime is 21020341427. The reversal of 21020341420 is 2414302012.

It is not an unprimeable number, because it can be changed into a prime (21020341427) 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, 40423474 + ... + 40423993.

It is an arithmetic number, because the mean of its divisors is an integer number (1980762966).

Almost surely, 2^21020341420 is an apocalyptic number.

21020341420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020341420 is an abundant number, since it is smaller than the sum of its proper divisors (26517969764).

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

21020341420 is a wasteful number, since it uses less digits than its factorization.

21020341420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80847489 (or 80847487 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21020341420 its reverse (2414302012), we get a palindrome (23434643432).

The spelling of 21020341420 in words is "twenty-one billion, twenty million, three hundred forty-one thousand, four hundred twenty".