21312244523 has 8 divisors (see below), whose sum is σ = 21517358592. Its totient is φ = 21107713536.

The previous prime is 21312244519. The next prime is 21312244627. The reversal of 21312244523 is 32544221312.

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 21312244523 - 2² = 21312244519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312241523) 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 7 ways as a sum of consecutive naturals, for example, 72140 + ... + 218697.

It is an arithmetic number, because the mean of its divisors is an integer number (2689669824).

Almost surely, 2^21312244523 is an apocalyptic number.

21312244523 is a deficient number, since it is larger than the sum of its proper divisors (205114069).

21312244523 is a wasteful number, since it uses less digits than its factorization.

21312244523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291541.

The product of its digits is 11520, while the sum is 29.

Adding to 21312244523 its reverse (32544221312), we get a palindrome (53856465835).

The spelling of 21312244523 in words is "twenty-one billion, three hundred twelve million, two hundred forty-four thousand, five hundred twenty-three".