21241312102 has 16 divisors (see below), whose sum is σ = 33220200960. Its totient is φ = 10173679488.

The previous prime is 21241312087. The next prime is 21241312193. The reversal of 21241312102 is 20121314212.

It is a self number, because there is not a number n which added to its sum of digits gives 21241312102.

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 7 ways as a sum of consecutive naturals, for example, 1434483 + ... + 1449214.

It is an arithmetic number, because the mean of its divisors is an integer number (2076262560).

Almost surely, 2^21241312102 is an apocalyptic number.

21241312102 is a deficient number, since it is larger than the sum of its proper divisors (11978888858).

21241312102 is a wasteful number, since it uses less digits than its factorization.

21241312102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883855.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21241312102 its reverse (20121314212), we get a palindrome (41362626314).

The spelling of 21241312102 in words is "twenty-one billion, two hundred forty-one million, three hundred twelve thousand, one hundred two".