21220001201 has 6 divisors (see below), whose sum is σ = 24684491250. Its totient is φ = 18188572416.

The previous prime is 21220001197. The next prime is 21220001213. The reversal of 21220001201 is 10210002212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19272102976 + 1947898225 = 138824^2 + 44135^2 .

It is not a de Polignac number, because 21220001201 - 2² = 21220001197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220001221) 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, 216530576 + ... + 216530673.

It is an arithmetic number, because the mean of its divisors is an integer number (4114081875).

Almost surely, 2^21220001201 is an apocalyptic number.

It is an amenable number.

21220001201 is a deficient number, since it is larger than the sum of its proper divisors (3464490049).

21220001201 is an equidigital number, since it uses as much as digits as its factorization.

21220001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433061263 (or 433061256 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21220001201 its reverse (10210002212), we get a palindrome (31430003413).

The spelling of 21220001201 in words is "twenty-one billion, two hundred twenty million, one thousand, two hundred one".