421021546 has 8 divisors (see below), whose sum is σ = 688944384. Its totient is φ = 191373420.

The previous prime is 421021543. The next prime is 421021553. The reversal of 421021546 is 645120124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 421021546.

It is not an unprimeable number, because it can be changed into a prime (421021543) 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, 9568650 + ... + 9568693.

It is an arithmetic number, because the mean of its divisors is an integer number (86118048).

Almost surely, 2^421021546 is an apocalyptic number.

421021546 is a deficient number, since it is larger than the sum of its proper divisors (267922838).

421021546 is a wasteful number, since it uses less digits than its factorization.

421021546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19137356.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 421021546 is about 20518.8095658593. The cubic root of 421021546 is about 749.4939080529.

The spelling of 421021546 in words is "four hundred twenty-one million, twenty-one thousand, five hundred forty-six".