42510323221 has 4 divisors (see below), whose sum is σ = 42574831200. Its totient is φ = 42445815244.

The previous prime is 42510323201. The next prime is 42510323231. The reversal of 42510323221 is 12232301524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42510323221 - 2¹⁷ = 42510192149 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 (42510323201) 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, 32253001 + ... + 32254318.

It is an arithmetic number, because the mean of its divisors is an integer number (10643707800).

Almost surely, 2^42510323221 is an apocalyptic number.

It is an amenable number.

42510323221 is a deficient number, since it is larger than the sum of its proper divisors (64507979).

42510323221 is an equidigital number, since it uses as much as digits as its factorization.

42510323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64507978.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 42510323221 its reverse (12232301524), we get a palindrome (54742624745).

The spelling of 42510323221 in words is "forty-two billion, five hundred ten million, three hundred twenty-three thousand, two hundred twenty-one".