21000213010221 has 8 divisors (see below), whose sum is σ = 29473983172320. Its totient is φ = 13263292427472.

The previous prime is 21000213010193. The next prime is 21000213010291. The reversal of 21000213010221 is 12201031200012.

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

It is not a de Polignac number, because 21000213010221 - 2⁹ = 21000213009709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000213010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000213010291) 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, 184212394770 + ... + 184212394883.

It is an arithmetic number, because the mean of its divisors is an integer number (3684247896540).

Almost surely, 2^{21000213010221} is an apocalyptic number.

It is an amenable number.

21000213010221 is a deficient number, since it is larger than the sum of its proper divisors (8473770162099).

21000213010221 is a wasteful number, since it uses less digits than its factorization.

21000213010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368424789675.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21000213010221 its reverse (12201031200012), we get a palindrome (33201244210233).

The spelling of 21000213010221 in words is "twenty-one trillion, two hundred thirteen million, ten thousand, two hundred twenty-one".