21002101110221 has 8 divisors (see below), whose sum is σ = 26184437747904. Its totient is φ = 16365273592320.

The previous prime is 21002101110127. The next prime is 21002101110223. The reversal of 21002101110221 is 12201110120012.

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 21002101110221 - 2¹⁴ = 21002101093837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002101110196 and 21002101110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002101110223) 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, 136377279860 + ... + 136377280013.

It is an arithmetic number, because the mean of its divisors is an integer number (3273054718488).

Almost surely, 2^{21002101110221} is an apocalyptic number.

It is an amenable number.

21002101110221 is a deficient number, since it is larger than the sum of its proper divisors (5182336637683).

21002101110221 is a wasteful number, since it uses less digits than its factorization.

21002101110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272754559891.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002101110221 its reverse (12201110120012), we get a palindrome (33203211230233).

The spelling of 21002101110221 in words is "twenty-one trillion, two billion, one hundred one million, one hundred ten thousand, two hundred twenty-one".