21301123110 has 64 divisors (see below), whose sum is σ = 52882502400. Its totient is φ = 5486977152.

The previous prime is 21301123087. The next prime is 21301123121. The reversal of 21301123110 is 1132110312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21301123110.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85261 + ... + 223319.

It is an arithmetic number, because the mean of its divisors is an integer number (826289100).

Almost surely, 2^21301123110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21301123110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26441251200).

21301123110 is an abundant number, since it is smaller than the sum of its proper divisors (31581379290).

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

21301123110 is a wasteful number, since it uses less digits than its factorization.

21301123110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138245.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21301123110 its reverse (1132110312), we get a palindrome (22433233422).

The spelling of 21301123110 in words is "twenty-one billion, three hundred one million, one hundred twenty-three thousand, one hundred ten".