201445421 has 4 divisors (see below), whose sum is σ = 205246332. Its totient is φ = 197644512.

The previous prime is 201445417. The next prime is 201445441. The reversal of 201445421 is 124544102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124544102 = 2 ⋅62272051.

It can be written as a sum of positive squares in 2 ways, for example, as 91489225 + 109956196 = 9565^2 + 10486^2 .

It is a cyclic number.

It is not a de Polignac number, because 201445421 - 2² = 201445417 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 (201445441) 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, 1900376 + ... + 1900481.

It is an arithmetic number, because the mean of its divisors is an integer number (51311583).

Almost surely, 2^201445421 is an apocalyptic number.

It is an amenable number.

201445421 is a deficient number, since it is larger than the sum of its proper divisors (3800911).

201445421 is an equidigital number, since it uses as much as digits as its factorization.

201445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800910.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 201445421 is about 14193.1469730994. The cubic root of 201445421 is about 586.2089795403.

Adding to 201445421 its reverse (124544102), we get a palindrome (325989523).

It can be divided in two parts, 20 and 1445421, that added together give a palindrome (1445441).

The spelling of 201445421 in words is "two hundred one million, four hundred forty-five thousand, four hundred twenty-one".