21202101000021 has 8 divisors (see below), whose sum is σ = 28298702200384. Its totient is φ = 14120116899840.

The previous prime is 21202100999939. The next prime is 21202101000029. The reversal of 21202101000021 is 12000010120212.

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

It is not a de Polignac number, because 21202101000021 - 2¹⁵ = 21202100967253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202100999970 and 21202101000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202101000029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3654271660 + ... + 3654277461.

It is an arithmetic number, because the mean of its divisors is an integer number (3537337775048).

Almost surely, 2^{21202101000021} is an apocalyptic number.

It is an amenable number.

21202101000021 is a deficient number, since it is larger than the sum of its proper divisors (7096601200363).

21202101000021 is an equidigital number, since it uses as much as digits as its factorization.

21202101000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308550091.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21202101000021 its reverse (12000010120212), we get a palindrome (33202111120233).

The spelling of 21202101000021 in words is "twenty-one trillion, two hundred two billion, one hundred one million, twenty-one", and thus it is an aban number.