21210220201 has 8 divisors (see below), whose sum is σ = 23297267520. Its totient is φ = 19220244912.

The previous prime is 21210220189. The next prime is 21210220211. The reversal of 21210220201 is 10202201212.

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 not a de Polignac number, because 21210220201 - 2¹⁷ = 21210089129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210220211) 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, 24267550 + ... + 24268423.

It is an arithmetic number, because the mean of its divisors is an integer number (2912158440).

Almost surely, 2^21210220201 is an apocalyptic number.

It is an amenable number.

21210220201 is a deficient number, since it is larger than the sum of its proper divisors (2087047319).

21210220201 is a wasteful number, since it uses less digits than its factorization.

21210220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48536015.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21210220201 its reverse (10202201212), we get a palindrome (31412421413).

The spelling of 21210220201 in words is "twenty-one billion, two hundred ten million, two hundred twenty thousand, two hundred one".