21211021010221 has 16 divisors (see below), whose sum is σ = 24491632211200. Its totient is φ = 17993034662400.

The previous prime is 21211021010213. The next prime is 21211021010227. The reversal of 21211021010221 is 12201012011212.

It is not a de Polignac number, because 21211021010221 - 2³ = 21211021010213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211021010195 and 21211021010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211021010227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31682896 + ... + 32345446.

It is an arithmetic number, because the mean of its divisors is an integer number (1530727013200).

Almost surely, 2^{21211021010221} is an apocalyptic number.

It is an amenable number.

21211021010221 is a deficient number, since it is larger than the sum of its proper divisors (3280611200979).

21211021010221 is an equidigital number, since it uses as much as digits as its factorization.

21211021010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709804.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211021010221 its reverse (12201012011212), we get a palindrome (33412033021433).

The spelling of 21211021010221 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, ten thousand, two hundred twenty-one".