21024321420 has 48 divisors (see below), whose sum is σ = 58884644448. Its totient is φ = 5604910080.

The previous prime is 21024321403. The next prime is 21024321449. The reversal of 21024321420 is 2412342012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174430 + ... + 269210.

It is an arithmetic number, because the mean of its divisors is an integer number (1226763426).

Almost surely, 2^21024321420 is an apocalyptic number.

21024321420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024321420 is an abundant number, since it is smaller than the sum of its proper divisors (37860323028).

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

21024321420 is a wasteful number, since it uses less digits than its factorization.

21024321420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98490 (or 98488 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21024321420 its reverse (2412342012), we get a palindrome (23436663432).

The spelling of 21024321420 in words is "twenty-one billion, twenty-four million, three hundred twenty-one thousand, four hundred twenty".