21100002222121 has 8 divisors (see below), whose sum is σ = 21102558642144. Its totient is φ = 21097445984160.

The previous prime is 21100002222037. The next prime is 21100002222127. The reversal of 21100002222121 is 12122220000112.

It is a happy number.

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 21100002222121 - 2²¹ = 21100000124969 is a prime.

It is a super-2 number, since 2×21100002222121² (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 = 21100002222095 and 21100002222104.

It is not an unprimeable number, because it can be changed into a prime (21100002222127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491213181 + ... + 491256133.

It is an arithmetic number, because the mean of its divisors is an integer number (2637819830268).

Almost surely, 2^{21100002222121} is an apocalyptic number.

It is an amenable number.

21100002222121 is a deficient number, since it is larger than the sum of its proper divisors (2556420023).

21100002222121 is a wasteful number, since it uses less digits than its factorization.

21100002222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91031.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21100002222121 its reverse (12122220000112), we get a palindrome (33222222222233).

The spelling of 21100002222121 in words is "twenty-one trillion, one hundred billion, two million, two hundred twenty-two thousand, one hundred twenty-one".