21010430020 has 48 divisors (see below), whose sum is σ = 45345807360. Its totient is φ = 8171362944.

The previous prime is 21010430009. The next prime is 21010430059. The reversal of 21010430020 is 2003401012.

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, 1150521 + ... + 1168639.

It is an arithmetic number, because the mean of its divisors is an integer number (944704320).

Almost surely, 2^21010430020 is an apocalyptic number.

21010430020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010430020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22672903680).

21010430020 is an abundant number, since it is smaller than the sum of its proper divisors (24335377340).

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

21010430020 is a wasteful number, since it uses less digits than its factorization.

21010430020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732 (or 19730 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21010430020 its reverse (2003401012), we get a palindrome (23013831032).

The spelling of 21010430020 in words is "twenty-one billion, ten million, four hundred thirty thousand, twenty".