421561541643 has 24 divisors (see below), whose sum is σ = 618923411904. Its totient is φ = 255037915440.

The previous prime is 421561541633. The next prime is 421561541651. The reversal of 421561541643 is 346145165124.

It is not a de Polignac number, because 421561541643 - 2⁹ = 421561541131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421561541595 and 421561541604.

It is not an unprimeable number, because it can be changed into a prime (421561541633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 827005 + ... + 1235742.

It is an arithmetic number, because the mean of its divisors is an integer number (25788475496).

Almost surely, 2^421561541643 is an apocalyptic number.

421561541643 is a deficient number, since it is larger than the sum of its proper divisors (197361870261).

421561541643 is a wasteful number, since it uses less digits than its factorization.

421561541643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063335 (or 2063324 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The spelling of 421561541643 in words is "four hundred twenty-one billion, five hundred sixty-one million, five hundred forty-one thousand, six hundred forty-three".