124121521 has 6 divisors (see below), whose sum is σ = 127077090. Its totient is φ = 121233168.

The previous prime is 124121513. The next prime is 124121533. The reversal of 124121521 is 125121421.

It can be written as a sum of positive squares in only one way, i.e., 113720896 + 10400625 = 10664^2 + 3225^2 .

It is not a de Polignac number, because 124121521 - 2³ = 124121513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124122521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31716 + ... + 35413.

It is an arithmetic number, because the mean of its divisors is an integer number (21179515).

Almost surely, 2^124121521 is an apocalyptic number.

It is an amenable number.

124121521 is a deficient number, since it is larger than the sum of its proper divisors (2955569).

124121521 is an frugal number, since it uses more digits than its factorization.

124121521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67215 (or 67172 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 124121521 is about 11140.9838434494. The cubic root of 124121521 is about 498.8259399906.

Adding to 124121521 its reverse (125121421), we get a palindrome (249242942).

The spelling of 124121521 in words is "one hundred twenty-four million, one hundred twenty-one thousand, five hundred twenty-one".