21011223301 has 4 divisors (see below), whose sum is σ = 21523692204. Its totient is φ = 20498754400.

The previous prime is 21011223271. The next prime is 21011223319. The reversal of 21011223301 is 10332211012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 960380100 + 20050843201 = 30990^2 + 141601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011223301 - 2¹⁵ = 21011190533 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 (21011223391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256234390 + ... + 256234471.

It is an arithmetic number, because the mean of its divisors is an integer number (5380923051).

Almost surely, 2^21011223301 is an apocalyptic number.

It is an amenable number.

21011223301 is a deficient number, since it is larger than the sum of its proper divisors (512468903).

21011223301 is an equidigital number, since it uses as much as digits as its factorization.

21011223301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512468902.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21011223301 its reverse (10332211012), we get a palindrome (31343434313).

The spelling of 21011223301 in words is "twenty-one billion, eleven million, two hundred twenty-three thousand, three hundred one".