21201021021102 has 64 divisors (see below), whose sum is σ = 46109105340480. Its totient is φ = 6459870541824.

The previous prime is 21201021021091. The next prime is 21201021021161. The reversal of 21201021021102 is 20112012010212.

It is a congruent number.

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, 8768524 + ... + 10921952.

It is an arithmetic number, because the mean of its divisors is an integer number (720454770945).

Almost surely, 2^{21201021021102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201021021102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23054552670240).

21201021021102 is an abundant number, since it is smaller than the sum of its proper divisors (24908084319378).

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

21201021021102 is a wasteful number, since it uses less digits than its factorization.

21201021021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154677.

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

Adding to 21201021021102 its reverse (20112012010212), we get a palindrome (41313033031314).

The spelling of 21201021021102 in words is "twenty-one trillion, two hundred one billion, twenty-one million, twenty-one thousand, one hundred two".