21020021312101 has 8 divisors (see below), whose sum is σ = 24029058666560. Its totient is φ = 18012528249408.

The previous prime is 21020021312099. The next prime is 21020021312137. The reversal of 21020021312101 is 10121312002012.

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

It is not a de Polignac number, because 21020021312101 - 2¹ = 21020021312099 is a prime.

It is a super-2 number, since 2×21020021312101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020021312701) 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, 386043771 + ... + 386098216.

It is an arithmetic number, because the mean of its divisors is an integer number (3003632333320).

Almost surely, 2^{21020021312101} is an apocalyptic number.

It is an amenable number.

21020021312101 is a deficient number, since it is larger than the sum of its proper divisors (3009037354459).

21020021312101 is an equidigital number, since it uses as much as digits as its factorization.

21020021312101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772145883.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21020021312101 its reverse (10121312002012), we get a palindrome (31141333314113).

The spelling of 21020021312101 in words is "twenty-one trillion, twenty billion, twenty-one million, three hundred twelve thousand, one hundred one".