21202730201020 has 24 divisors (see below), whose sum is σ = 44919766466064. Its totient is φ = 8406038167296.

The previous prime is 21202730200997. The next prime is 21202730201053. The reversal of 21202730201020 is 2010203720212.

It is a junction number, because it is equal to n+sod(n) for n = 21202730200982 and 21202730201000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4690867254 + ... + 4690871773.

It is an arithmetic number, because the mean of its divisors is an integer number (1871656936086).

Almost surely, 2^{21202730201020} is an apocalyptic number.

21202730201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202730201020 is an abundant number, since it is smaller than the sum of its proper divisors (23717036265044).

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

21202730201020 is a wasteful number, since it uses less digits than its factorization.

21202730201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9381739149 (or 9381739147 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21202730201020 its reverse (2010203720212), we get a palindrome (23212933921232).

The spelling of 21202730201020 in words is "twenty-one trillion, two hundred two billion, seven hundred thirty million, two hundred one thousand, twenty".