21221232311 has 16 divisors (see below), whose sum is σ = 23424069888. Its totient is φ = 19137216000.

The previous prime is 21221232289. The next prime is 21221232317. The reversal of 21221232311 is 11323212212.

It is a cyclic number.

It is not a de Polignac number, because 21221232311 - 2¹⁸ = 21220970167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221232317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146120 + ... + 252573.

It is an arithmetic number, because the mean of its divisors is an integer number (1464004368).

Almost surely, 2^21221232311 is an apocalyptic number.

21221232311 is a deficient number, since it is larger than the sum of its proper divisors (2202837577).

21221232311 is a wasteful number, since it uses less digits than its factorization.

21221232311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398842.

The product of its digits is 288, while the sum is 20.

Adding to 21221232311 its reverse (11323212212), we get a palindrome (32544444523).

The spelling of 21221232311 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, three hundred eleven".