21220101201 has 12 divisors (see below), whose sum is σ = 30637306608. Its totient is φ = 13058523504.

The previous prime is 21220101187. The next prime is 21220101209. The reversal of 21220101201 is 10210102212.

It is not a de Polignac number, because 21220101201 - 2⁶ = 21220101137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220101209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20926615 + ... + 20927628.

It is an arithmetic number, because the mean of its divisors is an integer number (2553108884).

Almost surely, 2^21220101201 is an apocalyptic number.

It is an amenable number.

21220101201 is a deficient number, since it is larger than the sum of its proper divisors (9417205407).

21220101201 is a wasteful number, since it uses less digits than its factorization.

21220101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41854272 (or 41854259 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21220101201 its reverse (10210102212), we get a palindrome (31430203413).

The spelling of 21220101201 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, two hundred one".