21324242263 has 4 divisors (see below), whose sum is σ = 21369904920. Its totient is φ = 21278579608.

The previous prime is 21324242257. The next prime is 21324242299. The reversal of 21324242263 is 36224242312.

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 21324242263 - 2²¹ = 21322145111 is a prime.

It is a super-2 number, since 2×21324242263² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324242363) 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, 22830628 + ... + 22831561.

It is an arithmetic number, because the mean of its divisors is an integer number (5342476230).

Almost surely, 2^21324242263 is an apocalyptic number.

21324242263 is a deficient number, since it is larger than the sum of its proper divisors (45662657).

21324242263 is an equidigital number, since it uses as much as digits as its factorization.

21324242263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45662656.

The product of its digits is 27648, while the sum is 31.

Adding to 21324242263 its reverse (36224242312), we get a palindrome (57548484575).

The spelling of 21324242263 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty-two thousand, two hundred sixty-three".