21211112002121 has 8 divisors (see below), whose sum is σ = 22458944330784. Its totient is φ = 19963292991040.

The previous prime is 21211112002111. The next prime is 21211112002127. The reversal of 21211112002121 is 12120021111212.

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 21211112002121 - 2¹⁰ = 21211112001097 is a prime.

It is a super-2 number, since 2×21211112002121² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211112002121.

It is not an unprimeable number, because it can be changed into a prime (21211112002127) 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, 47606 + ... + 6513408.

It is an arithmetic number, because the mean of its divisors is an integer number (2807368041348).

Almost surely, 2^{21211112002121} is an apocalyptic number.

It is an amenable number.

21211112002121 is a deficient number, since it is larger than the sum of its proper divisors (1247832328663).

21211112002121 is a wasteful number, since it uses less digits than its factorization.

21211112002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658791.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211112002121 its reverse (12120021111212), we get a palindrome (33331133113333).

The spelling of 21211112002121 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, two thousand, one hundred twenty-one".