21220212201 has 16 divisors (see below), whose sum is σ = 28966527744. Its totient is φ = 13810691664.

The previous prime is 21220212179. The next prime is 21220212217. The reversal of 21220212201 is 10221202212.

It is not a de Polignac number, because 21220212201 - 2⁹ = 21220211689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220212271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214930 + ... + 297716.

It is an arithmetic number, because the mean of its divisors is an integer number (1810407984).

Almost surely, 2^21220212201 is an apocalyptic number.

It is an amenable number.

21220212201 is a deficient number, since it is larger than the sum of its proper divisors (7746315543).

21220212201 is a wasteful number, since it uses less digits than its factorization.

21220212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84820.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220212201 its reverse (10221202212), we get a palindrome (31441414413).

The spelling of 21220212201 in words is "twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred one".