421545550 has 24 divisors (see below), whose sum is σ = 785559096. Its totient is φ = 168299040.

The previous prime is 421545539. The next prime is 421545557. The reversal of 421545550 is 55545124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421545557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19644 + ... + 35056.

It is an arithmetic number, because the mean of its divisors is an integer number (32731629).

Almost surely, 2^421545550 is an apocalyptic number.

421545550 is a deficient number, since it is larger than the sum of its proper divisors (364013546).

421545550 is a wasteful number, since it uses less digits than its factorization.

421545550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15972 (or 15967 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 421545550 is about 20531.5744647117. The cubic root of 421545550 is about 749.8047195288.

The spelling of 421545550 in words is "four hundred twenty-one million, five hundred forty-five thousand, five hundred fifty".