21020230110 has 80 divisors (see below), whose sum is σ = 55494222480. Its totient is φ = 5095706880.

The previous prime is 21020230097. The next prime is 21020230139. The reversal of 21020230110 is 1103202012.

It is a super-2 number, since 2×21020230110² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 415302 + ... + 463158.

It is an arithmetic number, because the mean of its divisors is an integer number (693677781).

Almost surely, 2^21020230110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020230110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27747111240).

21020230110 is an abundant number, since it is smaller than the sum of its proper divisors (34473992370).

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

21020230110 is an equidigital number, since it uses as much as digits as its factorization.

21020230110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47911 (or 47878 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21020230110 its reverse (1103202012), we get a palindrome (22123432122).

The spelling of 21020230110 in words is "twenty-one billion, twenty million, two hundred thirty thousand, one hundred ten".