421552999 has 4 divisors (see below), whose sum is σ = 481774864. Its totient is φ = 361331136.

The previous prime is 421552997. The next prime is 421553023. The reversal of 421552999 is 999255124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421552999 - 2¹ = 421552997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421552991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30110922 + ... + 30110935.

It is an arithmetic number, because the mean of its divisors is an integer number (120443716).

Almost surely, 2^421552999 is an apocalyptic number.

421552999 is a deficient number, since it is larger than the sum of its proper divisors (60221865).

421552999 is an equidigital number, since it uses as much as digits as its factorization.

421552999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60221864.

The product of its digits is 291600, while the sum is 46.

The square root of 421552999 is about 20531.7558674362. The cubic root of 421552999 is about 749.8091360246.

It can be divided in two parts, 42155 and 2999, that added together give a palindrome (45154).

The spelling of 421552999 in words is "four hundred twenty-one million, five hundred fifty-two thousand, nine hundred ninety-nine".