423001021 has 8 divisors (see below), whose sum is σ = 448451640. Its totient is φ = 397613568.

The previous prime is 423000973. The next prime is 423001037. The reversal of 423001021 is 120100324.

It can be written as a sum of positive squares in 4 ways, for example, as 181198521 + 241802500 = 13461^2 + 15550^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 423001021 - 2¹⁷ = 422869949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423000992 and 423001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423005021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626 + ... + 29131.

It is an arithmetic number, because the mean of its divisors is an integer number (56056455).

Almost surely, 2^423001021 is an apocalyptic number.

It is an amenable number.

423001021 is a deficient number, since it is larger than the sum of its proper divisors (25450619).

423001021 is a wasteful number, since it uses less digits than its factorization.

423001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31583.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 423001021 is about 20566.9886225475. The cubic root of 423001021 is about 750.6666789137. Note that the first 4 decimals are identical.

Adding to 423001021 its reverse (120100324), we get a palindrome (543101345).

The spelling of 423001021 in words is "four hundred twenty-three million, one thousand, twenty-one".