421721022 has 8 divisors (see below), whose sum is σ = 843442056. Its totient is φ = 140573672.

The previous prime is 421721009. The next prime is 421721029. The reversal of 421721022 is 220127124.

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

421721022 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 421721022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421721029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35143413 + ... + 35143424.

It is an arithmetic number, because the mean of its divisors is an integer number (105430257).

Almost surely, 2^421721022 is an apocalyptic number.

421721022 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421721022 is a wasteful number, since it uses less digits than its factorization.

421721022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70286842.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 421721022 is about 20535.8472432963. The cubic root of 421721022 is about 749.9087426744.

Adding to 421721022 its reverse (220127124), we get a palindrome (641848146).

The spelling of 421721022 in words is "four hundred twenty-one million, seven hundred twenty-one thousand, twenty-two".