21211002002121 has 8 divisors (see below), whose sum is σ = 28281357276000. Its totient is φ = 14140657364832.

The previous prime is 21211002002107. The next prime is 21211002002123. The reversal of 21211002002121 is 12120020011212.

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

It is not a de Polignac number, because 21211002002121 - 2⁷ = 21211002001993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211002002121.

It is not an unprimeable number, because it can be changed into a prime (21211002002123) 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, 6553726 + ... + 9239768.

It is an arithmetic number, because the mean of its divisors is an integer number (3535169659500).

Almost surely, 2^{21211002002121} is an apocalyptic number.

It is an amenable number.

21211002002121 is a deficient number, since it is larger than the sum of its proper divisors (7070355273879).

21211002002121 is a wasteful number, since it uses less digits than its factorization.

21211002002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318295.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211002002121 its reverse (12120020011212), we get a palindrome (33331022013333).

The spelling of 21211002002121 in words is "twenty-one trillion, two hundred eleven billion, two million, two thousand, one hundred twenty-one".