21020323030 has 64 divisors (see below), whose sum is σ = 45885958272. Its totient is φ = 6768138240.

The previous prime is 21020323021. The next prime is 21020323069. The reversal of 21020323030 is 3032302012.

It is a junction number, because it is equal to n+sod(n) for n = 21020322995 and 21020323013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 529432 + ... + 567748.

It is an arithmetic number, because the mean of its divisors is an integer number (716968098).

Almost surely, 2^21020323030 is an apocalyptic number.

21020323030 is an abundant number, since it is smaller than the sum of its proper divisors (24865635242).

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

21020323030 is a wasteful number, since it uses less digits than its factorization.

21020323030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38809.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21020323030 its reverse (3032302012), we get a palindrome (24052625042).

The spelling of 21020323030 in words is "twenty-one billion, twenty million, three hundred twenty-three thousand, thirty".