124145021 has 16 divisors (see below), whose sum is σ = 166685568. Its totient is φ = 89294400.

The previous prime is 124145017. The next prime is 124145023. The reversal of 124145021 is 120541421.

It is a happy number.

It is not a de Polignac number, because 124145021 - 2² = 124145017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 124144984 and 124145002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124145023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61010 + ... + 63011.

It is an arithmetic number, because the mean of its divisors is an integer number (10417848).

Almost surely, 2^124145021 is an apocalyptic number.

124145021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

124145021 is a deficient number, since it is larger than the sum of its proper divisors (42540547).

124145021 is a wasteful number, since it uses less digits than its factorization.

124145021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124052.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 124145021 is about 11142.0384580201. The cubic root of 124145021 is about 498.8574190062.

Adding to 124145021 its reverse (120541421), we get a palindrome (244686442).

The spelling of 124145021 in words is "one hundred twenty-four million, one hundred forty-five thousand, twenty-one".