21340430201 has 4 divisors (see below), whose sum is σ = 21382356900. Its totient is φ = 21298503504.

The previous prime is 21340430179. The next prime is 21340430207. The reversal of 21340430201 is 10203404312.

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 13334475625 + 8005954576 = 115475^2 + 89476^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340430201 - 2²⁶ = 21273321337 is a prime.

It is a super-2 number, since 2×21340430201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340430207) 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, 20962586 + ... + 20963603.

It is an arithmetic number, because the mean of its divisors is an integer number (5345589225).

Almost surely, 2^21340430201 is an apocalyptic number.

It is an amenable number.

21340430201 is a deficient number, since it is larger than the sum of its proper divisors (41926699).

21340430201 is an equidigital number, since it uses as much as digits as its factorization.

21340430201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41926698.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21340430201 its reverse (10203404312), we get a palindrome (31543834513).

The spelling of 21340430201 in words is "twenty-one billion, three hundred forty million, four hundred thirty thousand, two hundred one".