21220210112201 has 4 divisors (see below), whose sum is σ = 21222084534804. Its totient is φ = 21218335689600.

The previous prime is 21220210112141. The next prime is 21220210112239. The reversal of 21220210112201 is 10221101202212.

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 2921501377600 + 18298708734601 = 1709240^2 + 4277699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220210112201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220210112201.

It is not an unprimeable number, because it can be changed into a prime (21220210112291) 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, 937194320 + ... + 937216961.

It is an arithmetic number, because the mean of its divisors is an integer number (5305521133701).

Almost surely, 2^{21220210112201} is an apocalyptic number.

It is an amenable number.

21220210112201 is a deficient number, since it is larger than the sum of its proper divisors (1874422603).

21220210112201 is a wasteful number, since it uses less digits than its factorization.

21220210112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874422602.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220210112201 its reverse (10221101202212), we get a palindrome (31441311314413).

The spelling of 21220210112201 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred twelve thousand, two hundred one".