21011012110221 has 8 divisors (see below), whose sum is σ = 32016780358464. Its totient is φ = 12006292634400.

The previous prime is 21011012110213. The next prime is 21011012110223. The reversal of 21011012110221 is 12201121011012.

It is a happy number.

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

It is not a de Polignac number, because 21011012110221 - 2³ = 21011012110213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011012110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011012110223) 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, 500262193080 + ... + 500262193121.

It is an arithmetic number, because the mean of its divisors is an integer number (4002097544808).

Almost surely, 2^{21011012110221} is an apocalyptic number.

21011012110221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21011012110221 is a deficient number, since it is larger than the sum of its proper divisors (11005768248243).

21011012110221 is a wasteful number, since it uses less digits than its factorization.

21011012110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000524386211.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011012110221 its reverse (12201121011012), we get a palindrome (33212133121233).

The spelling of 21011012110221 in words is "twenty-one trillion, eleven billion, twelve million, one hundred ten thousand, two hundred twenty-one".