21243314201 has 4 divisors (see below), whose sum is σ = 21243742992. Its totient is φ = 21242885412.

The previous prime is 21243314179. The next prime is 21243314251. The reversal of 21243314201 is 10241334212.

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 21243314201 - 2⁶ = 21243314137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243314251) 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, 128651 + ... + 242976.

It is an arithmetic number, because the mean of its divisors is an integer number (5310935748).

Almost surely, 2^21243314201 is an apocalyptic number.

It is an amenable number.

21243314201 is a deficient number, since it is larger than the sum of its proper divisors (428791).

21243314201 is an equidigital number, since it uses as much as digits as its factorization.

21243314201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428790.

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

Adding to 21243314201 its reverse (10241334212), we get a palindrome (31484648413).

The spelling of 21243314201 in words is "twenty-one billion, two hundred forty-three million, three hundred fourteen thousand, two hundred one".