21221120311 has 8 divisors (see below), whose sum is σ = 22346120880. Its totient is φ = 20096929728.

The previous prime is 21221120251. The next prime is 21221120321. The reversal of 21221120311 is 11302112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221120311 - 2²¹ = 21219023159 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 (21221120321) 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 7 ways as a sum of consecutive naturals, for example, 148336 + ... + 253861.

It is an arithmetic number, because the mean of its divisors is an integer number (2793265110).

Almost surely, 2^21221120311 is an apocalyptic number.

21221120311 is a deficient number, since it is larger than the sum of its proper divisors (1125000569).

21221120311 is a wasteful number, since it uses less digits than its factorization.

21221120311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404993.

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

Adding to 21221120311 its reverse (11302112212), we get a palindrome (32523232523).

The spelling of 21221120311 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, three hundred eleven".