21220201010201 has 4 divisors (see below), whose sum is σ = 21430302010404. Its totient is φ = 21010100010000.

The previous prime is 21220201010023. The next prime is 21220201010219. The reversal of 21220201010201 is 10201010202212.

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 19074925225225 + 2145275784976 = 4367485^2 + 1464676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220201010201 - 2³⁴ = 21203021141017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21220201019201) 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, 105050499950 + ... + 105050500151.

It is an arithmetic number, because the mean of its divisors is an integer number (5357575502601).

Almost surely, 2^{21220201010201} is an apocalyptic number.

It is an amenable number.

21220201010201 is a deficient number, since it is larger than the sum of its proper divisors (210101000203).

21220201010201 is a wasteful number, since it uses less digits than its factorization.

21220201010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210101000202.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220201010201 its reverse (10201010202212), we get a palindrome (31421211212413).

The spelling of 21220201010201 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, ten thousand, two hundred one".