21010110220 has 24 divisors (see below), whose sum is σ = 48132253008. Its totient is φ = 7640040000.

The previous prime is 21010110179. The next prime is 21010110239. The reversal of 21010110220 is 2201101012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21010110197 and 21010110206.

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, 47750031 + ... + 47750470.

It is an arithmetic number, because the mean of its divisors is an integer number (2005510542).

Almost surely, 2^21010110220 is an apocalyptic number.

21010110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010110220 is an abundant number, since it is smaller than the sum of its proper divisors (27122142788).

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

21010110220 is a wasteful number, since it uses less digits than its factorization.

21010110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95500521 (or 95500519 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010110220 its reverse (2201101012), we get a palindrome (23211211232).

The spelling of 21010110220 in words is "twenty-one billion, ten million, one hundred ten thousand, two hundred twenty".