21224404023 has 8 divisors (see below), whose sum is σ = 28422783600. Its totient is φ = 14087813568.

The previous prime is 21224404021. The next prime is 21224404049. The reversal of 21224404023 is 32040442212.

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

It is not a de Polignac number, because 21224404023 - 2¹ = 21224404021 is a prime.

It is a super-2 number, since 2×21224404023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21224403984 and 21224404002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224404021) 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, 15446478 + ... + 15447851.

It is an arithmetic number, because the mean of its divisors is an integer number (3552847950).

Almost surely, 2^21224404023 is an apocalyptic number.

21224404023 is a deficient number, since it is larger than the sum of its proper divisors (7198379577).

21224404023 is a wasteful number, since it uses less digits than its factorization.

21224404023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30894561.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21224404023 its reverse (32040442212), we get a palindrome (53264846235).

The spelling of 21224404023 in words is "twenty-one billion, two hundred twenty-four million, four hundred four thousand, twenty-three".