424021021 has 8 divisors (see below), whose sum is σ = 454374144. Its totient is φ = 394269120.

The previous prime is 424021001. The next prime is 424021033. The reversal of 424021021 is 120120424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 424020986 and 424021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424021001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148845 + ... + 151666.

It is an arithmetic number, because the mean of its divisors is an integer number (56796768).

Almost surely, 2^424021021 is an apocalyptic number.

It is an amenable number.

424021021 is a deficient number, since it is larger than the sum of its proper divisors (30353123).

424021021 is a wasteful number, since it uses less digits than its factorization.

424021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300611.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 424021021 is about 20591.7707106504. The cubic root of 424021021 is about 751.2695658722.

Adding to 424021021 its reverse (120120424), we get a palindrome (544141445).

The spelling of 424021021 in words is "four hundred twenty-four million, twenty-one thousand, twenty-one".