21002110010221 has 8 divisors (see below), whose sum is σ = 21011470853184. Its totient is φ = 20992750630080.

The previous prime is 21002110010149. The next prime is 21002110010281. The reversal of 21002110010221 is 12201001120012.

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 21002110010221 - 2²¹ = 21002107913069 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 (21002110010281) 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, 28874416 + ... + 29592838.

It is an arithmetic number, because the mean of its divisors is an integer number (2626433856648).

Almost surely, 2^{21002110010221} is an apocalyptic number.

It is an amenable number.

21002110010221 is a deficient number, since it is larger than the sum of its proper divisors (9360842963).

21002110010221 is a wasteful number, since it uses less digits than its factorization.

21002110010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731411.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002110010221 its reverse (12201001120012), we get a palindrome (33203111130233).

The spelling of 21002110010221 in words is "twenty-one trillion, two billion, one hundred ten million, ten thousand, two hundred twenty-one".