424350021 has 4 divisors (see below), whose sum is σ = 565800032. Its totient is φ = 282900012.

The previous prime is 424350013. The next prime is 424350067. The reversal of 424350021 is 120053424.

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 not a de Polignac number, because 424350021 - 2³ = 424350013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 424350021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424352021) 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, 70725001 + ... + 70725006.

It is an arithmetic number, because the mean of its divisors is an integer number (141450008).

Almost surely, 2^424350021 is an apocalyptic number.

It is an amenable number.

424350021 is a deficient number, since it is larger than the sum of its proper divisors (141450011).

424350021 is a wasteful number, since it uses less digits than its factorization.

424350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141450010.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 424350021 is about 20599.7577898382. The cubic root of 424350021 is about 751.4638202262.

The spelling of 424350021 in words is "four hundred twenty-four million, three hundred fifty thousand, twenty-one".