21010010000221 has 4 divisors (see below), whose sum is σ = 22920010909344. Its totient is φ = 19100009091100.

The previous prime is 21010010000141. The next prime is 21010010000227. The reversal of 21010010000221 is 12200001001012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010010000221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010010000198 and 21010010000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010010000227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955000454545 + ... + 955000454566.

It is an arithmetic number, because the mean of its divisors is an integer number (5730002727336).

Almost surely, 2^{21010010000221} is an apocalyptic number.

It is an amenable number.

21010010000221 is a deficient number, since it is larger than the sum of its proper divisors (1910000909123).

21010010000221 is a wasteful number, since it uses less digits than its factorization.

21010010000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910000909122.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010010000221 its reverse (12200001001012), we get a palindrome (33210011001233).

The spelling of 21010010000221 in words is "twenty-one trillion, ten billion, ten million, two hundred twenty-one", and thus it is an aban number.