21021212312102 has 16 divisors (see below), whose sum is σ = 31706897337024. Its totient is φ = 10452249720000.

The previous prime is 21021212312047. The next prime is 21021212312119. The reversal of 21021212312102 is 20121321212012.

It is a congruent number.

It is an unprimeable number.

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, 12732227 + ... + 14288177.

It is an arithmetic number, because the mean of its divisors is an integer number (1981681083564).

Almost surely, 2^{21021212312102} is an apocalyptic number.

21021212312102 is a deficient number, since it is larger than the sum of its proper divisors (10685685024922).

21021212312102 is a wasteful number, since it uses less digits than its factorization.

21021212312102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593455.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21021212312102 its reverse (20121321212012), we get a palindrome (41142533524114).

The spelling of 21021212312102 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred twelve thousand, one hundred two".