21011202121021 has 8 divisors (see below), whose sum is σ = 24156591661440. Its totient is φ = 17901759889968.

The previous prime is 21011202120983. The next prime is 21011202121037. The reversal of 21011202121021 is 12012120211012.

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 21011202121021 - 2¹³ = 21011202112829 is a prime.

It is a super-2 number, since 2×21011202121021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011202120986 and 21011202121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8986826086 + ... + 8986828423.

It is an arithmetic number, because the mean of its divisors is an integer number (3019573957680).

Almost surely, 2^{21011202121021} is an apocalyptic number.

It is an amenable number.

21011202121021 is a deficient number, since it is larger than the sum of its proper divisors (3145389540419).

21011202121021 is a wasteful number, since it uses less digits than its factorization.

21011202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17973654683.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011202121021 its reverse (12012120211012), we get a palindrome (33023322332033).

The spelling of 21011202121021 in words is "twenty-one trillion, eleven billion, two hundred two million, one hundred twenty-one thousand, twenty-one".