21211012211021 has 8 divisors (see below), whose sum is σ = 21340538316864. Its totient is φ = 21081879205120.

The previous prime is 21211012210961. The next prime is 21211012211029. The reversal of 21211012211021 is 12011221011212.

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 21211012211021 - 2²⁶ = 21210945102157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211012211029) 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, 98166740 + ... + 98382573.

It is an arithmetic number, because the mean of its divisors is an integer number (2667567289608).

Almost surely, 2^{21211012211021} is an apocalyptic number.

It is an amenable number.

21211012211021 is a deficient number, since it is larger than the sum of its proper divisors (129526105843).

21211012211021 is a wasteful number, since it uses less digits than its factorization.

21211012211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196549971.

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

Adding to 21211012211021 its reverse (12011221011212), we get a palindrome (33222233222233).

The spelling of 21211012211021 in words is "twenty-one trillion, two hundred eleven billion, twelve million, two hundred eleven thousand, twenty-one".