21112110100221 has 8 divisors (see below), whose sum is σ = 32170834438464. Its totient is φ = 12064062914400.

The previous prime is 21112110100219. The next prime is 21112110100229. The reversal of 21112110100221 is 12200101121112.

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 21112110100221 - 2¹ = 21112110100219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112110100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112110100229) 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, 502669288080 + ... + 502669288121.

It is an arithmetic number, because the mean of its divisors is an integer number (4021354304808).

Almost surely, 2^{21112110100221} is an apocalyptic number.

21112110100221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21112110100221 is a deficient number, since it is larger than the sum of its proper divisors (11058724338243).

21112110100221 is a wasteful number, since it uses less digits than its factorization.

21112110100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005338576211.

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

Adding to 21112110100221 its reverse (12200101121112), we get a palindrome (33312211221333).

The spelling of 21112110100221 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, one hundred thousand, two hundred twenty-one".