21221030211001 has 4 divisors (see below), whose sum is σ = 21221039452752. Its totient is φ = 21221020969252.

The previous prime is 21221030210993. The next prime is 21221030211037. The reversal of 21221030211001 is 10011203012212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21221030211001 - 2³ = 21221030210993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221030211041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766586 + ... + 6750028.

It is an arithmetic number, because the mean of its divisors is an integer number (5305259863188).

Almost surely, 2^{21221030211001} is an apocalyptic number.

It is an amenable number.

21221030211001 is a deficient number, since it is larger than the sum of its proper divisors (9241751).

21221030211001 is an equidigital number, since it uses as much as digits as its factorization.

21221030211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9241750.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21221030211001 its reverse (10011203012212), we get a palindrome (31232233223213).

The spelling of 21221030211001 in words is "twenty-one trillion, two hundred twenty-one billion, thirty million, two hundred eleven thousand, one".