21331112010 has 64 divisors (see below), whose sum is σ = 55352626560. Its totient is φ = 5229792000.

The previous prime is 21331111933. The next prime is 21331112027. The reversal of 21331112010 is 1021113312.

It is a happy number.

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

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, 11065 + ... + 206844.

It is an arithmetic number, because the mean of its divisors is an integer number (864884790).

Almost surely, 2^21331112010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21331112010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27676313280).

21331112010 is an abundant number, since it is smaller than the sum of its proper divisors (34021514550).

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

21331112010 is a wasteful number, since it uses less digits than its factorization.

21331112010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218183.

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

Adding to 21331112010 its reverse (1021113312), we get a palindrome (22352225322).

The spelling of 21331112010 in words is "twenty-one billion, three hundred thirty-one million, one hundred twelve thousand, ten".