124142021 has 4 divisors (see below), whose sum is σ = 125637792. Its totient is φ = 122646252.

The previous prime is 124141999. The next prime is 124142023. The reversal of 124142021 is 120241421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 124142021 - 2⁶ = 124141957 is a prime.

It is a super-2 number, since 2×124142021² = 30822482755928882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124142023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747761 + ... + 747926.

It is an arithmetic number, because the mean of its divisors is an integer number (31409448).

Almost surely, 2^124142021 is an apocalyptic number.

It is an amenable number.

124142021 is a deficient number, since it is larger than the sum of its proper divisors (1495771).

124142021 is an equidigital number, since it uses as much as digits as its factorization.

124142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495770.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 124142021 is about 11141.9038319311. The cubic root of 124142021 is about 498.8534006297.

Adding to 124142021 its reverse (120241421), we get a palindrome (244383442).

The spelling of 124142021 in words is "one hundred twenty-four million, one hundred forty-two thousand, twenty-one".