21445313023 has 4 divisors (see below), whose sum is σ = 21479299888. Its totient is φ = 21411326160.

The previous prime is 21445312969. The next prime is 21445313027. The reversal of 21445313023 is 32031354412.

It is a happy number.

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 21445313023 - 2¹³ = 21445304831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21445312982 and 21445313000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445313027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16992486 + ... + 16993747.

It is an arithmetic number, because the mean of its divisors is an integer number (5369824972).

Almost surely, 2^21445313023 is an apocalyptic number.

21445313023 is a deficient number, since it is larger than the sum of its proper divisors (33986865).

21445313023 is an equidigital number, since it uses as much as digits as its factorization.

21445313023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33986864.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21445313023 its reverse (32031354412), we get a palindrome (53476667435).

The spelling of 21445313023 in words is "twenty-one billion, four hundred forty-five million, three hundred thirteen thousand, twenty-three".