624142021 has 4 divisors (see below), whose sum is σ = 629975232. Its totient is φ = 618308812.

The previous prime is 624141983. The next prime is 624142037. The reversal of 624142021 is 120241426.

It is a happy number.

624142021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 624142021 - 2¹⁷ = 624010949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 624141983 and 624142001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624142081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916445 + ... + 2916658.

It is an arithmetic number, because the mean of its divisors is an integer number (157493808).

Almost surely, 2^624142021 is an apocalyptic number.

It is an amenable number.

624142021 is a deficient number, since it is larger than the sum of its proper divisors (5833211).

624142021 is a wasteful number, since it uses less digits than its factorization.

624142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833210.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 624142021 is about 24982.8345269307. The cubic root of 624142021 is about 854.5965612572.

Adding to 624142021 its reverse (120241426), we get a palindrome (744383447).

The spelling of 624142021 in words is "six hundred twenty-four million, one hundred forty-two thousand, twenty-one".