421042313521 has 8 divisors (see below), whose sum is σ = 445826617704. Its totient is φ = 396259910400.

The previous prime is 421042313513. The next prime is 421042313537. The reversal of 421042313521 is 125313240124.

It can be written as a sum of positive squares in 4 ways, for example, as 59253296400 + 361789017121 = 243420^2 + 601489^2 .

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 421042313521 - 2³ = 421042313513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421042313521.

It is not an unprimeable number, because it can be changed into a prime (421042313221) 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, 6030 + ... + 917671.

It is an arithmetic number, because the mean of its divisors is an integer number (55728327213).

Almost surely, 2^421042313521 is an apocalyptic number.

It is an amenable number.

421042313521 is a deficient number, since it is larger than the sum of its proper divisors (24784304183).

421042313521 is a wasteful number, since it uses less digits than its factorization.

421042313521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950531.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 421042313521 its reverse (125313240124), we get a palindrome (546355553645).

The spelling of 421042313521 in words is "four hundred twenty-one billion, forty-two million, three hundred thirteen thousand, five hundred twenty-one".