421335261553 has 4 divisors (see below), whose sum is σ = 425506897908. Its totient is φ = 417163625200.

The previous prime is 421335261527. The next prime is 421335261563. The reversal of 421335261553 is 355162533124.

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 173895672064 + 247439589489 = 417008^2 + 497433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421335261553 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421335261563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085818026 + ... + 2085818227.

It is an arithmetic number, because the mean of its divisors is an integer number (106376724477).

Almost surely, 2^421335261553 is an apocalyptic number.

It is an amenable number.

421335261553 is a deficient number, since it is larger than the sum of its proper divisors (4171636355).

421335261553 is a wasteful number, since it uses less digits than its factorization.

421335261553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171636354.

The product of its digits is 324000, while the sum is 40.

Adding to 421335261553 its reverse (355162533124), we get a palindrome (776497794677).

The spelling of 421335261553 in words is "four hundred twenty-one billion, three hundred thirty-five million, two hundred sixty-one thousand, five hundred fifty-three".