21012111101010 has 128 divisors (see below), whose sum is σ = 53731857876480. Its totient is φ = 5247604555776.

The previous prime is 21012111100979. The next prime is 21012111101029. The reversal of 21012111101010 is 1010111121012.

21012111101010 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 63 ways as a sum of consecutive naturals, for example, 5378226 + ... + 8423154.

It is an arithmetic number, because the mean of its divisors is an integer number (419780139660).

Almost surely, 2^{21012111101010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012111101010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26865928938240).

21012111101010 is an abundant number, since it is smaller than the sum of its proper divisors (32719746775470).

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

21012111101010 is a wasteful number, since it uses less digits than its factorization.

21012111101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045172.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21012111101010 its reverse (1010111121012), we get a palindrome (22022222222022).

The spelling of 21012111101010 in words is "twenty-one trillion, twelve billion, one hundred eleven million, one hundred one thousand, ten".