21201010110 has 48 divisors (see below), whose sum is σ = 62997289056. Its totient is φ = 4845945024.

The previous prime is 21201010093. The next prime is 21201010183. The reversal of 21201010110 is 1101010212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21201010092 and 21201010101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16825569 + ... + 16826828.

It is an arithmetic number, because the mean of its divisors is an integer number (1312443522).

Almost surely, 2^21201010110 is an apocalyptic number.

21201010110 is an abundant number, since it is smaller than the sum of its proper divisors (41796278946).

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

21201010110 is a wasteful number, since it uses less digits than its factorization.

21201010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33652417 (or 33652414 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21201010110 its reverse (1101010212), we get a palindrome (22302020322).

The spelling of 21201010110 in words is "twenty-one billion, two hundred one million, ten thousand, one hundred ten".