21022100000221 has 8 divisors (see below), whose sum is σ = 21260214201600. Its totient is φ = 20784028261920.

The previous prime is 21022100000173. The next prime is 21022100000233. The reversal of 21022100000221 is 12200000122012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21022100000221 - 2²¹ = 21022097903069 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 (21022100000621) 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, 9619501 + ... + 11600818.

It is an arithmetic number, because the mean of its divisors is an integer number (2657526775200).

Almost surely, 2^{21022100000221} is an apocalyptic number.

It is an amenable number.

21022100000221 is a deficient number, since it is larger than the sum of its proper divisors (238114201379).

21022100000221 is a wasteful number, since it uses less digits than its factorization.

21022100000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21231539.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022100000221 its reverse (12200000122012), we get a palindrome (33222100122233).

The spelling of 21022100000221 in words is "twenty-one trillion, twenty-two billion, one hundred million, two hundred twenty-one", and thus it is an aban number.