21244023311 has 8 divisors (see below), whose sum is σ = 24357970560. Its totient is φ = 18149847768.

The previous prime is 21244023277. The next prime is 21244023343. The reversal of 21244023311 is 11332044212.

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 21244023311 - 2⁶ = 21244023247 is a prime.

It is a super-2 number, since 2×21244023311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244023371) 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, 4940621 + ... + 4944918.

It is an arithmetic number, because the mean of its divisors is an integer number (3044746320).

Almost surely, 2^21244023311 is an apocalyptic number.

21244023311 is a deficient number, since it is larger than the sum of its proper divisors (3113947249).

21244023311 is an equidigital number, since it uses as much as digits as its factorization.

21244023311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9885853.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21244023311 its reverse (11332044212), we get a palindrome (32576067523).

The spelling of 21244023311 in words is "twenty-one billion, two hundred forty-four million, twenty-three thousand, three hundred eleven".