21002101112021 has 8 divisors (see below), whose sum is σ = 21010679726400. Its totient is φ = 20993523325632.

The previous prime is 21002101111993. The next prime is 21002101112033. The reversal of 21002101112021 is 12021110120012.

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 21002101112021 - 2¹⁰ = 21002101110997 is a prime.

It is a super-2 number, since 2×21002101112021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002101111987 and 21002101112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002101112051) 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, 53344736 + ... + 53736998.

It is an arithmetic number, because the mean of its divisors is an integer number (2626334965800).

Almost surely, 2^{21002101112021} is an apocalyptic number.

It is an amenable number.

21002101112021 is a deficient number, since it is larger than the sum of its proper divisors (8578614379).

21002101112021 is a wasteful number, since it uses less digits than its factorization.

21002101112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413995.

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

Adding to 21002101112021 its reverse (12021110120012), we get a palindrome (33023211232033).

The spelling of 21002101112021 in words is "twenty-one trillion, two billion, one hundred one million, one hundred twelve thousand, twenty-one".