124521021 has 12 divisors (see below), whose sum is σ = 184725372. Its totient is φ = 80770176.

The previous prime is 124521013. The next prime is 124521029. The reversal of 124521021 is 120125421.

124521021 is a `hidden beast` number, since 124 + 521 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (124521013) and next prime (124521029).

It can be written as a sum of positive squares in 2 ways, for example, as 91584900 + 32936121 = 9570^2 + 5739^2 .

It is not a de Polignac number, because 124521021 - 2³ = 124521013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 124520985 and 124521003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124521029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186636 + ... + 187301.

It is an arithmetic number, because the mean of its divisors is an integer number (15393781).

Almost surely, 2^124521021 is an apocalyptic number.

It is an amenable number.

124521021 is a deficient number, since it is larger than the sum of its proper divisors (60204351).

124521021 is a wasteful number, since it uses less digits than its factorization.

124521021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373980 (or 373977 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 124521021 is about 11158.8987359865. The cubic root of 124521021 is about 499.3605438737.

Adding to 124521021 its reverse (120125421), we get a palindrome (244646442).

The spelling of 124521021 in words is "one hundred twenty-four million, five hundred twenty-one thousand, twenty-one".