123434521 has 16 divisors (see below), whose sum is σ = 142829568. Its totient is φ = 104490000.

The previous prime is 123434503. The next prime is 123434551. The reversal of 123434521 is 125434321.

It is a cyclic number.

It is not a de Polignac number, because 123434521 - 2⁵ = 123434489 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (123434551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286176 + ... + 286606.

It is an arithmetic number, because the mean of its divisors is an integer number (8926848).

Almost surely, 2^123434521 is an apocalyptic number.

It is an amenable number.

123434521 is a deficient number, since it is larger than the sum of its proper divisors (19395047).

123434521 is a wasteful number, since it uses less digits than its factorization.

123434521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

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

The square root of 123434521 is about 11110.1089553613. The cubic root of 123434521 is about 497.9039198416.

Adding to 123434521 its reverse (125434321), we get a palindrome (248868842).

The spelling of 123434521 in words is "one hundred twenty-three million, four hundred thirty-four thousand, five hundred twenty-one".