21213121300201 has 4 divisors (see below), whose sum is σ = 21221016026112. Its totient is φ = 21205226574292.

The previous prime is 21213121300193. The next prime is 21213121300207. The reversal of 21213121300201 is 10200312131212.

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 21213121300201 - 2³ = 21213121300193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213121300207) 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, 3947358925 + ... + 3947364298.

It is an arithmetic number, because the mean of its divisors is an integer number (5305254006528).

Almost surely, 2^{21213121300201} is an apocalyptic number.

It is an amenable number.

21213121300201 is a deficient number, since it is larger than the sum of its proper divisors (7894725911).

21213121300201 is an equidigital number, since it uses as much as digits as its factorization.

21213121300201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894725910.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21213121300201 its reverse (10200312131212), we get a palindrome (31413433431413).

The spelling of 21213121300201 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty-one million, three hundred thousand, two hundred one".