201321421 has 4 divisors (see below), whose sum is σ = 230081632. Its totient is φ = 172561212.

The previous prime is 201321391. The next prime is 201321427. The reversal of 201321421 is 124123102.

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 a cyclic number.

It is not a de Polignac number, because 201321421 - 2¹⁹ = 200797133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201321395 and 201321404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321427) 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, 14380095 + ... + 14380108.

It is an arithmetic number, because the mean of its divisors is an integer number (57520408).

Almost surely, 2^201321421 is an apocalyptic number.

It is an amenable number.

201321421 is a deficient number, since it is larger than the sum of its proper divisors (28760211).

201321421 is an equidigital number, since it uses as much as digits as its factorization.

201321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28760210.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201321421 is about 14188.7779953032. Note that the first 3 decimals coincide. The cubic root of 201321421 is about 586.0886742769.

Adding to 201321421 its reverse (124123102), we get a palindrome (325444523).

The spelling of 201321421 in words is "two hundred one million, three hundred twenty-one thousand, four hundred twenty-one".