21202030020 has 48 divisors (see below), whose sum is σ = 59414116608. Its totient is φ = 5649262080.

The previous prime is 21202029973. The next prime is 21202030037. The reversal of 21202030020 is 2003020212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21202029978 and 21202030005.

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, 69669 + ... + 217388.

It is an arithmetic number, because the mean of its divisors is an integer number (1237794096).

Almost surely, 2^21202030020 is an apocalyptic number.

21202030020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202030020 is an abundant number, since it is smaller than the sum of its proper divisors (38212086588).

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

21202030020 is a wasteful number, since it uses less digits than its factorization.

21202030020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288300 (or 288298 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21202030020 its reverse (2003020212), we get a palindrome (23205050232).

The spelling of 21202030020 in words is "twenty-one billion, two hundred two million, thirty thousand, twenty".