21210222211201 has 4 divisors (see below), whose sum is σ = 21222750400852. Its totient is φ = 21197694021552.

The previous prime is 21210222211193. The next prime is 21210222211271. The reversal of 21210222211201 is 10211222201212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11393655951601 + 9816566259600 = 3375449^2 + 3133140^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210222211201 - 2³ = 21210222211193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210222211271) 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, 6264092286 + ... + 6264095671.

It is an arithmetic number, because the mean of its divisors is an integer number (5305687600213).

Almost surely, 2^{21210222211201} is an apocalyptic number.

It is an amenable number.

21210222211201 is a deficient number, since it is larger than the sum of its proper divisors (12528189651).

21210222211201 is a wasteful number, since it uses less digits than its factorization.

21210222211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12528189650.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21210222211201 its reverse (10211222201212), we get a palindrome (31421444412413).

The spelling of 21210222211201 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred eleven thousand, two hundred one".