221212220210001 has 20 divisors (see below), whose sum is σ = 330637743437232. Its totient is φ = 147392286900408.

The previous prime is 221212220209991. The next prime is 221212220210011. The reversal of 221212220210001 is 100012022212122.

It is a happy number.

221212220210001 is a `hidden beast` number, since 2 + 21 + 212 + 220 + 210 + 0 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (221212220209991) and next prime (221212220210011).

It is not a de Polignac number, because 221212220210001 - 2⁷ = 221212220209873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221212220210011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 763989295 + ... + 764278788.

Almost surely, 2^{221212220210001} is an apocalyptic number.

It is an amenable number.

221212220210001 is a deficient number, since it is larger than the sum of its proper divisors (109425523227231).

221212220210001 is a wasteful number, since it uses less digits than its factorization.

221212220210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528269882 (or 1528269873 counting only the distinct ones).

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

Adding to 221212220210001 its reverse (100012022212122), we get a palindrome (321224242422123).

The spelling of 221212220210001 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred ten thousand, one".