21020112012102 has 192 divisors, whose sum is σ = 49803300748800. Its totient is φ = 5895950860800.

The previous prime is 21020112012089. The next prime is 21020112012127. The reversal of 21020112012102 is 20121021102012.

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 95 ways as a sum of consecutive naturals, for example, 8979115452 + ... + 8979117792.

It is an arithmetic number, because the mean of its divisors is an integer number (259392191400).

Almost surely, 2^{21020112012102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020112012102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24901650374400).

21020112012102 is an abundant number, since it is smaller than the sum of its proper divisors (28783188736698).

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

21020112012102 is a wasteful number, since it uses less digits than its factorization.

21020112012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787 (or 3780 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020112012102 its reverse (20121021102012), we get a palindrome (41141133114114).

The spelling of 21020112012102 in words is "twenty-one trillion, twenty billion, one hundred twelve million, twelve thousand, one hundred two".