212220001210221 has 10 divisors (see below), whose sum is σ = 317020001807982. Its totient is φ = 141480000806760.

The previous prime is 212220001210117. The next prime is 212220001210247. The reversal of 212220001210221 is 122012100022212.

It is a happy number.

212220001210221 is a `hidden beast` number, since 2 + 12 + 220 + 0 + 0 + 1 + 210 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 132177812853321 + 80042188356900 = 11496861^2 + 8946630^2 .

It is not a de Polignac number, because 212220001210221 - 2¹⁰ = 212220001209197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212220001210194 and 212220001210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220001210291) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1310000007390 + ... + 1310000007551.

Almost surely, 2^{212220001210221} is an apocalyptic number.

It is an amenable number.

212220001210221 is a deficient number, since it is larger than the sum of its proper divisors (104800000597761).

212220001210221 is an equidigital number, since it uses as much as digits as its factorization.

212220001210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620000014953 (or 2620000014944 counting only the distinct ones).

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

Adding to 212220001210221 its reverse (122012100022212), we get a palindrome (334232101232433).

The spelling of 212220001210221 in words is "two hundred twelve trillion, two hundred twenty billion, one million, two hundred ten thousand, two hundred twenty-one".