423145221 has 8 divisors (see below), whose sum is σ = 564728640. Its totient is φ = 281829312.

The previous prime is 423145213. The next prime is 423145223. The reversal of 423145221 is 122541324.

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

It is not a de Polignac number, because 423145221 - 2³ = 423145213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423145191 and 423145200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423145223) 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, 63156 + ... + 69533.

It is an arithmetic number, because the mean of its divisors is an integer number (70591080).

Almost surely, 2^423145221 is an apocalyptic number.

It is an amenable number.

423145221 is a deficient number, since it is larger than the sum of its proper divisors (141583419).

423145221 is a wasteful number, since it uses less digits than its factorization.

423145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133755.

The product of its digits is 1920, while the sum is 24.

The square root of 423145221 is about 20570.4939415659. The cubic root of 423145221 is about 750.7519693597.

Adding to 423145221 its reverse (122541324), we get a palindrome (545686545).

The spelling of 423145221 in words is "four hundred twenty-three million, one hundred forty-five thousand, two hundred twenty-one".