21223652911 has 4 divisors (see below), whose sum is σ = 21741303024. Its totient is φ = 20706002800.

The previous prime is 21223652909. The next prime is 21223652921. The reversal of 21223652911 is 11925632212.

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 21223652911 - 2¹ = 21223652909 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 (21223652921) 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 3 ways as a sum of consecutive naturals, for example, 258824995 + ... + 258825076.

It is an arithmetic number, because the mean of its divisors is an integer number (5435325756).

Almost surely, 2^21223652911 is an apocalyptic number.

21223652911 is a deficient number, since it is larger than the sum of its proper divisors (517650113).

21223652911 is an equidigital number, since it uses as much as digits as its factorization.

21223652911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517650112.

The product of its digits is 12960, while the sum is 34.

The spelling of 21223652911 in words is "twenty-one billion, two hundred twenty-three million, six hundred fifty-two thousand, nine hundred eleven".