421553102561 has 8 divisors (see below), whose sum is σ = 422965476864. Its totient is φ = 420142868640.

The previous prime is 421553102557. The next prime is 421553102567. The reversal of 421553102561 is 165201355124.

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 421553102561 - 2² = 421553102557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421553102567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140045 + ... + 928826.

It is an arithmetic number, because the mean of its divisors is an integer number (52870684608).

Almost surely, 2^421553102561 is an apocalyptic number.

It is an amenable number.

421553102561 is a deficient number, since it is larger than the sum of its proper divisors (1412374303).

421553102561 is a wasteful number, since it uses less digits than its factorization.

421553102561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070191.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 421553102561 its reverse (165201355124), we get a palindrome (586754457685).

The spelling of 421553102561 in words is "four hundred twenty-one billion, five hundred fifty-three million, one hundred two thousand, five hundred sixty-one".