421312345 has 8 divisors (see below), whose sum is σ = 507077064. Its totient is φ = 336048384.

The previous prime is 421312301. The next prime is 421312349. The reversal of 421312345 is 543213124.

It can be written as a sum of positive squares in 4 ways, for example, as 11978521 + 409333824 = 3461^2 + 20232^2 .

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 421312345 - 2⁷ = 421312217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421312349) 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, 123334 + ... + 126703.

It is an arithmetic number, because the mean of its divisors is an integer number (63384633).

Almost surely, 2^421312345 is an apocalyptic number.

It is an amenable number.

421312345 is a deficient number, since it is larger than the sum of its proper divisors (85764719).

421312345 is a wasteful number, since it uses less digits than its factorization.

421312345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250379.

The product of its digits is 2880, while the sum is 25.

The square root of 421312345 is about 20525.8944993878. The cubic root of 421312345 is about 749.6664264751. Note that the first 3 decimals are identical.

Adding to 421312345 its reverse (543213124), we get a palindrome (964525469).

The spelling of 421312345 in words is "four hundred twenty-one million, three hundred twelve thousand, three hundred forty-five".