23145215421 has 8 divisors (see below), whose sum is σ = 31366193824. Its totient is φ = 15177190320.

The previous prime is 23145215419. The next prime is 23145215447. The reversal of 23145215421 is 12451254132.

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

It is not a de Polignac number, because 23145215421 - 2¹ = 23145215419 is a prime.

It is a super-5 number, since 5×23145215421⁵ (a number of 53 digits) contains 55555 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 (23145215461) 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 7 ways as a sum of consecutive naturals, for example, 63238111 + ... + 63238476.

It is an arithmetic number, because the mean of its divisors is an integer number (3920774228).

Almost surely, 2^23145215421 is an apocalyptic number.

It is an amenable number.

23145215421 is a deficient number, since it is larger than the sum of its proper divisors (8220978403).

23145215421 is a wasteful number, since it uses less digits than its factorization.

23145215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126476651.

The product of its digits is 9600, while the sum is 30.

Adding to 23145215421 its reverse (12451254132), we get a palindrome (35596469553).

The spelling of 23145215421 in words is "twenty-three billion, one hundred forty-five million, two hundred fifteen thousand, four hundred twenty-one".