124550021 has 2 divisors, whose sum is σ = 124550022. Its totient is φ = 124550020.

The previous prime is 124550017. The next prime is 124550039. The reversal of 124550021 is 120055421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 59505796 = 8065^2 + 7714^2 .

It is a cyclic number.

It is not a de Polignac number, because 124550021 - 2² = 124550017 is a prime.

It is a super-2 number, since 2×124550021² = 31025415462200882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 124549975 and 124550002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124550051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62275010 + 62275011.

It is an arithmetic number, because the mean of its divisors is an integer number (62275011).

Almost surely, 2^124550021 is an apocalyptic number.

It is an amenable number.

124550021 is a deficient number, since it is larger than the sum of its proper divisors (1).

124550021 is an equidigital number, since it uses as much as digits as its factorization.

124550021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 124550021 is about 11160.1980717190. The cubic root of 124550021 is about 499.3993066239.

The spelling of 124550021 in words is "one hundred twenty-four million, five hundred fifty thousand, twenty-one".