201340213421 has 4 divisors (see below), whose sum is σ = 203602463100. Its totient is φ = 199077963744.

The previous prime is 201340213387. The next prime is 201340213483. The reversal of 201340213421 is 124312043102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70444591396 + 130895622025 = 265414^2 + 361795^2 .

It is a cyclic number.

It is not a de Polignac number, because 201340213421 - 2¹⁰ = 201340212397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201340213121) 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, 1131124706 + ... + 1131124883.

It is an arithmetic number, because the mean of its divisors is an integer number (50900615775).

Almost surely, 2^201340213421 is an apocalyptic number.

It is an amenable number.

201340213421 is a deficient number, since it is larger than the sum of its proper divisors (2262249679).

201340213421 is an equidigital number, since it uses as much as digits as its factorization.

201340213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262249678.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 201340213421 its reverse (124312043102), we get a palindrome (325652256523).

The spelling of 201340213421 in words is "two hundred one billion, three hundred forty million, two hundred thirteen thousand, four hundred twenty-one".