21002100112221 has 8 divisors (see below), whose sum is σ = 28149411669504. Its totient is φ = 13928094314880.

The previous prime is 21002100112171. The next prime is 21002100112349. The reversal of 21002100112221 is 12221100120012.

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

It is not a de Polignac number, because 21002100112221 - 2¹⁸ = 21002099850077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002100112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002100110221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18326439316 + ... + 18326440461.

It is an arithmetic number, because the mean of its divisors is an integer number (3518676458688).

Almost surely, 2^{21002100112221} is an apocalyptic number.

It is an amenable number.

21002100112221 is a deficient number, since it is larger than the sum of its proper divisors (7147311557283).

21002100112221 is a wasteful number, since it uses less digits than its factorization.

21002100112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36652879971.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002100112221 its reverse (12221100120012), we get a palindrome (33223200232233).

The spelling of 21002100112221 in words is "twenty-one trillion, two billion, one hundred million, one hundred twelve thousand, two hundred twenty-one".