123142521 has 4 divisors (see below), whose sum is σ = 164190032. Its totient is φ = 82095012.

The previous prime is 123142519. The next prime is 123142531. The reversal of 123142521 is 125241321.

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 not a de Polignac number, because 123142521 - 2¹ = 123142519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123142501) 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, 20523751 + ... + 20523756.

It is an arithmetic number, because the mean of its divisors is an integer number (41047508).

Almost surely, 2^123142521 is an apocalyptic number.

It is an amenable number.

123142521 is a deficient number, since it is larger than the sum of its proper divisors (41047511).

123142521 is an equidigital number, since it uses as much as digits as its factorization.

123142521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41047510.

The product of its digits is 480, while the sum is 21.

The square root of 123142521 is about 11096.9599891141. The cubic root of 123142521 is about 497.5109915671.

Adding to 123142521 its reverse (125241321), we get a palindrome (248383842).

The spelling of 123142521 in words is "one hundred twenty-three million, one hundred forty-two thousand, five hundred twenty-one".