21000221103311 has 2 divisors, whose sum is σ = 21000221103312. Its totient is φ = 21000221103310.

The previous prime is 21000221103289. The next prime is 21000221103361. The reversal of 21000221103311 is 11330112200012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000221103311 - 2¹⁸ = 21000220841167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000221103311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000221103361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500110551655 + 10500110551656.

It is an arithmetic number, because the mean of its divisors is an integer number (10500110551656).

Almost surely, 2^{21000221103311} is an apocalyptic number.

21000221103311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000221103311 is an equidigital number, since it uses as much as digits as its factorization.

21000221103311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21000221103311 its reverse (11330112200012), we get a palindrome (32330333303323).

The spelling of 21000221103311 in words is "twenty-one trillion, two hundred twenty-one million, one hundred three thousand, three hundred eleven".