424023021 has 6 divisors (see below), whose sum is σ = 612477710. Its totient is φ = 282682008.

The previous prime is 424023011. The next prime is 424023023. The reversal of 424023021 is 120320424.

It can be written as a sum of positive squares in only one way, i.e., 414326025 + 9696996 = 20355^2 + 3114^2 .

It is not a de Polignac number, because 424023021 - 2⁹ = 424022509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 424022985 and 424023003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424023023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23556826 + ... + 23556843.

Almost surely, 2^424023021 is an apocalyptic number.

It is an amenable number.

424023021 is a deficient number, since it is larger than the sum of its proper divisors (188454689).

424023021 is a wasteful number, since it uses less digits than its factorization.

424023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47113675 (or 47113672 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 424023021 is about 20591.8192736824. The cubic root of 424023021 is about 751.2707470532.

Adding to 424023021 its reverse (120320424), we get a palindrome (544343445).

It can be divided in two parts, 4240 and 23021, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 424023021 in words is "four hundred twenty-four million, twenty-three thousand, twenty-one".