21221301311 has 4 divisors (see below), whose sum is σ = 24252915792. Its totient is φ = 18189686832.

The previous prime is 21221301301. The next prime is 21221301341. The reversal of 21221301311 is 11310312212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221301311 - 2⁶ = 21221301247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221301311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221301301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515807230 + ... + 1515807243.

It is an arithmetic number, because the mean of its divisors is an integer number (6063228948).

Almost surely, 2^21221301311 is an apocalyptic number.

21221301311 is a deficient number, since it is larger than the sum of its proper divisors (3031614481).

21221301311 is an equidigital number, since it uses as much as digits as its factorization.

21221301311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031614480.

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

Adding to 21221301311 its reverse (11310312212), we get a palindrome (32531613523).

The spelling of 21221301311 in words is "twenty-one billion, two hundred twenty-one million, three hundred one thousand, three hundred eleven".