21101020021103 has 16 divisors (see below), whose sum is σ = 23077868889600. Its totient is φ = 19133965361280.

The previous prime is 21101020021097. The next prime is 21101020021121. The reversal of 21101020021103 is 30112002010112.

It is not a de Polignac number, because 21101020021103 - 2¹⁴ = 21101020004719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101020024103) 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, 12493628 + ... + 14081646.

It is an arithmetic number, because the mean of its divisors is an integer number (1442366805600).

Almost surely, 2^{21101020021103} is an apocalyptic number.

21101020021103 is a deficient number, since it is larger than the sum of its proper divisors (1976848868497).

21101020021103 is a wasteful number, since it uses less digits than its factorization.

21101020021103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591102.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21101020021103 its reverse (30112002010112), we get a palindrome (51213022031215).

The spelling of 21101020021103 in words is "twenty-one trillion, one hundred one billion, twenty million, twenty-one thousand, one hundred three".