21012331110 has 16 divisors (see below), whose sum is σ = 50429594736. Its totient is φ = 5603288288.

The previous prime is 21012331103. The next prime is 21012331111. The reversal of 21012331110 is 1113321012.

It is a happy number.

21012331110 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 21012331110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012331111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 350205489 + ... + 350205548.

It is an arithmetic number, because the mean of its divisors is an integer number (3151849671).

Almost surely, 2^21012331110 is an apocalyptic number.

21012331110 is an abundant number, since it is smaller than the sum of its proper divisors (29417263626).

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

21012331110 is a wasteful number, since it uses less digits than its factorization.

21012331110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700411047.

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

Adding to 21012331110 its reverse (1113321012), we get a palindrome (22125652122).

The spelling of 21012331110 in words is "twenty-one billion, twelve million, three hundred thirty-one thousand, one hundred ten".