21020000002110 has 96 divisors (see below), whose sum is σ = 57065924418048. Its totient is φ = 5358073997760.

The previous prime is 21020000002051. The next prime is 21020000002129. The reversal of 21020000002110 is 1120000002012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21020000002092 and 21020000002101.

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 47 ways as a sum of consecutive naturals, for example, 232452 + ... + 6487991.

It is an arithmetic number, because the mean of its divisors is an integer number (594436712688).

Almost surely, 2^{21020000002110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020000002110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28532962209024).

21020000002110 is an abundant number, since it is smaller than the sum of its proper divisors (36045924415938).

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

21020000002110 is a wasteful number, since it uses less digits than its factorization.

21020000002110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6721990 (or 6721987 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21020000002110 its reverse (1120000002012), we get a palindrome (22140000004122).

The spelling of 21020000002110 in words is "twenty-one trillion, twenty billion, two thousand, one hundred ten".