421311300521 has 4 divisors (see below), whose sum is σ = 421319587332. Its totient is φ = 421303013712.

The previous prime is 421311300517. The next prime is 421311300541. The reversal of 421311300521 is 125003113124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 404669010496 + 16642290025 = 636136^2 + 129005^2 .

It is a cyclic number.

It is not a de Polignac number, because 421311300521 - 2² = 421311300517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421311300511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4066670 + ... + 4168983.

It is an arithmetic number, because the mean of its divisors is an integer number (105329896833).

Almost surely, 2^421311300521 is an apocalyptic number.

It is an amenable number.

421311300521 is a deficient number, since it is larger than the sum of its proper divisors (8286811).

421311300521 is an equidigital number, since it uses as much as digits as its factorization.

421311300521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286810.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 421311300521 its reverse (125003113124), we get a palindrome (546314413645).

The spelling of 421311300521 in words is "four hundred twenty-one billion, three hundred eleven million, three hundred thousand, five hundred twenty-one".