221212210201 has 16 divisors (see below), whose sum is σ = 241193852928. Its totient is φ = 202058099200.

The previous prime is 221212210181. The next prime is 221212210207. The reversal of 221212210201 is 102012212122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221212210201 - 2⁵ = 221212210169 is a prime.

It is a super-2 number, since 2×221212210201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212210207) 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, 697705 + ... + 963958.

It is an arithmetic number, because the mean of its divisors is an integer number (15074615808).

Almost surely, 2^221212210201 is an apocalyptic number.

It is an amenable number.

221212210201 is a deficient number, since it is larger than the sum of its proper divisors (19981642727).

221212210201 is a wasteful number, since it uses less digits than its factorization.

221212210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661912.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221212210201 its reverse (102012212122), we get a palindrome (323224422323).

It can be divided in two parts, 2212122 and 10201, that multiplied together give a palindrome (22565856522).

The spelling of 221212210201 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, two hundred one".