21000010201221 has 8 divisors (see below), whose sum is σ = 28000107481600. Its totient is φ = 13999959860832.

The previous prime is 21000010201199. The next prime is 21000010201231. The reversal of 21000010201221 is 12210201000012.

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

It is not a de Polignac number, because 21000010201221 - 2¹⁴ = 21000010184837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000010201197 and 21000010201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010201231) 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, 10677496 + ... + 12490353.

It is an arithmetic number, because the mean of its divisors is an integer number (3500013435200).

Almost surely, 2^{21000010201221} is an apocalyptic number.

It is an amenable number.

21000010201221 is a deficient number, since it is larger than the sum of its proper divisors (7000097280379).

21000010201221 is a wasteful number, since it uses less digits than its factorization.

21000010201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469995.

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

Adding to 21000010201221 its reverse (12210201000012), we get a palindrome (33210211201233).

The spelling of 21000010201221 in words is "twenty-one trillion, ten million, two hundred one thousand, two hundred twenty-one".