21101020021101 has 8 divisors (see below), whose sum is σ = 28137882909664. Its totient is φ = 14065751906640.

The previous prime is 21101020021097. The next prime is 21101020021121. The reversal of 21101020021101 is 10112002010112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101020021101 - 2² = 21101020021097 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 (21101020021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398662651 + ... + 398715576.

It is an arithmetic number, because the mean of its divisors is an integer number (3517235363708).

Almost surely, 2^{21101020021101} is an apocalyptic number.

It is an amenable number.

21101020021101 is a deficient number, since it is larger than the sum of its proper divisors (7036862888563).

21101020021101 is an equidigital number, since it uses as much as digits as its factorization.

21101020021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797387051.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101020021101 its reverse (10112002010112), we get a palindrome (31213022031213).

The spelling of 21101020021101 in words is "twenty-one trillion, one hundred one billion, twenty million, twenty-one thousand, one hundred one".