21103320201 has 4 divisors (see below), whose sum is σ = 28137760272. Its totient is φ = 14068880132.

The previous prime is 21103320193. The next prime is 21103320239. The reversal of 21103320201 is 10202330112.

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 21103320201 - 2³ = 21103320193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103320101) 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, 3517220031 + ... + 3517220036.

It is an arithmetic number, because the mean of its divisors is an integer number (7034440068).

Almost surely, 2^21103320201 is an apocalyptic number.

It is an amenable number.

21103320201 is a deficient number, since it is larger than the sum of its proper divisors (7034440071).

21103320201 is an equidigital number, since it uses as much as digits as its factorization.

21103320201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034440070.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21103320201 its reverse (10202330112), we get a palindrome (31305650313).

The spelling of 21103320201 in words is "twenty-one billion, one hundred three million, three hundred twenty thousand, two hundred one".