21220122120201 has 6 divisors (see below), whose sum is σ = 30651287506970. Its totient is φ = 14146748080128.

The previous prime is 21220122120149. The next prime is 21220122120209. The reversal of 21220122120201 is 10202122102212.

It is a happy number.

21220122120201 is a `hidden beast` number, since 2 + 1 + 220 + 1 + 221 + 20 + 201 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20924229638601 + 295892481600 = 4574301^2 + 543960^2 .

It is not a de Polignac number, because 21220122120201 - 2⁶ = 21220122120137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220122120209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178895673336 + ... + 1178895673353.

Almost surely, 2^{21220122120201} is an apocalyptic number.

It is an amenable number.

21220122120201 is a deficient number, since it is larger than the sum of its proper divisors (9431165386769).

21220122120201 is a wasteful number, since it uses less digits than its factorization.

21220122120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357791346695 (or 2357791346692 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21220122120201 its reverse (10202122102212), we get a palindrome (31422244222413).

The spelling of 21220122120201 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred twenty thousand, two hundred one".