23147421521 has 8 divisors (see below), whose sum is σ = 27366409920. Its totient is φ = 19156486608.

The previous prime is 23147421511. The next prime is 23147421533. The reversal of 23147421521 is 12512474132.

It is a happy number.

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

It is not a de Polignac number, because 23147421521 - 2¹⁸ = 23147159377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23147421511) 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, 57013151 + ... + 57013556.

It is an arithmetic number, because the mean of its divisors is an integer number (3420801240).

Almost surely, 2^23147421521 is an apocalyptic number.

It is an amenable number.

23147421521 is a deficient number, since it is larger than the sum of its proper divisors (4218988399).

23147421521 is a wasteful number, since it uses less digits than its factorization.

23147421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114026743.

The product of its digits is 13440, while the sum is 32.

Adding to 23147421521 its reverse (12512474132), we get a palindrome (35659895653).

The spelling of 23147421521 in words is "twenty-three billion, one hundred forty-seven million, four hundred twenty-one thousand, five hundred twenty-one".