423624023621 has 4 divisors (see below), whose sum is σ = 448543083852. Its totient is φ = 398704963392.

The previous prime is 423624023611. The next prime is 423624023651. The reversal of 423624023621 is 126320426324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119238996100 + 304385027521 = 345310^2 + 551711^2 .

It is a cyclic number.

It is not a de Polignac number, because 423624023621 - 2²² = 423619829317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423624023611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12459530090 + ... + 12459530123.

It is an arithmetic number, because the mean of its divisors is an integer number (112135770963).

Almost surely, 2^423624023621 is an apocalyptic number.

It is an amenable number.

423624023621 is a deficient number, since it is larger than the sum of its proper divisors (24919060231).

423624023621 is a wasteful number, since it uses less digits than its factorization.

423624023621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24919060230.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 423624023621 its reverse (126320426324), we get a palindrome (549944449945).

The spelling of 423624023621 in words is "four hundred twenty-three billion, six hundred twenty-four million, twenty-three thousand, six hundred twenty-one".