21301221320201 has 4 divisors (see below), whose sum is σ = 21344604663504. Its totient is φ = 21257837976900.

The previous prime is 21301221320143. The next prime is 21301221320209. The reversal of 21301221320201 is 10202312210312.

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 a de Polignac number, because none of the positive numbers 2^k-21301221320201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301221320209) 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, 21691670915 + ... + 21691671896.

It is an arithmetic number, because the mean of its divisors is an integer number (5336151165876).

Almost surely, 2^{21301221320201} is an apocalyptic number.

It is an amenable number.

21301221320201 is a deficient number, since it is larger than the sum of its proper divisors (43383343303).

21301221320201 is an equidigital number, since it uses as much as digits as its factorization.

21301221320201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43383343302.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21301221320201 its reverse (10202312210312), we get a palindrome (31503533530513).

The spelling of 21301221320201 in words is "twenty-one trillion, three hundred one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred one".