21010020221104 has 80 divisors (see below), whose sum is σ = 43394001177600. Its totient is φ = 9831426176000.

The previous prime is 21010020221101. The next prime is 21010020221111. The reversal of 21010020221104 is 40112202001012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21010020221101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56042472 + ... + 56416120.

It is an arithmetic number, because the mean of its divisors is an integer number (542425014720).

Almost surely, 2^{21010020221104} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010020221104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21697000588800).

21010020221104 is an abundant number, since it is smaller than the sum of its proper divisors (22383980956496).

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

21010020221104 is a wasteful number, since it uses less digits than its factorization.

21010020221104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376978 (or 376972 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21010020221104 its reverse (40112202001012), we get a palindrome (61122222222116).

The spelling of 21010020221104 in words is "twenty-one trillion, ten billion, twenty million, two hundred twenty-one thousand, one hundred four".