21201210220201 has 8 divisors (see below), whose sum is σ = 24489098436384. Its totient is φ = 18140072915520.

The previous prime is 21201210220189. The next prime is 21201210220241. The reversal of 21201210220201 is 10202201210212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201210220201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201210220241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56687727675 + ... + 56687728048.

It is an arithmetic number, because the mean of its divisors is an integer number (3061137304548).

Almost surely, 2^{21201210220201} is an apocalyptic number.

It is an amenable number.

21201210220201 is a deficient number, since it is larger than the sum of its proper divisors (3287888216183).

21201210220201 is a wasteful number, since it uses less digits than its factorization.

21201210220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113375455751.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201210220201 its reverse (10202201210212), we get a palindrome (31403411430413).

The spelling of 21201210220201 in words is "twenty-one trillion, two hundred one billion, two hundred ten million, two hundred twenty thousand, two hundred one".