21202020030 has 64 divisors (see below), whose sum is σ = 52589150208. Its totient is φ = 5464942080.

The previous prime is 21202020013. The next prime is 21202020041. The reversal of 21202020030 is 3002020212.

It is a junction number, because it is equal to n+sod(n) for n = 21202019988 and 21202020015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789382 + ... + 815798.

It is an arithmetic number, because the mean of its divisors is an integer number (821705472).

Almost surely, 2^21202020030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202020030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26294575104).

21202020030 is an abundant number, since it is smaller than the sum of its proper divisors (31387130178).

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

21202020030 is a wasteful number, since it uses less digits than its factorization.

21202020030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27321.

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

Adding to 21202020030 its reverse (3002020212), we get a palindrome (24204040242).

The spelling of 21202020030 in words is "twenty-one billion, two hundred two million, twenty thousand, thirty".