421444222221001 has 4 divisors (see below), whose sum is σ = 481650539681152. Its totient is φ = 361237904760852.

The previous prime is 421444222220947. The next prime is 421444222221013. The reversal of 421444222221001 is 100122222444124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 421444222221001 - 2¹⁹ = 421444221696713 is a prime.

It is a super-2 number, since 2×421444222221001² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421444222221401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30103158730065 + ... + 30103158730078.

It is an arithmetic number, because the mean of its divisors is an integer number (120412634920288).

Almost surely, 2^{421444222221001} is an apocalyptic number.

It is an amenable number.

421444222221001 is a deficient number, since it is larger than the sum of its proper divisors (60206317460151).

421444222221001 is an equidigital number, since it uses as much as digits as its factorization.

421444222221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60206317460150.

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 421444222221001 its reverse (100122222444124), we get a palindrome (521566444665125).

The spelling of 421444222221001 in words is "four hundred twenty-one trillion, four hundred forty-four billion, two hundred twenty-two million, two hundred twenty-one thousand, one".