212002222221 has 6 divisors (see below), whose sum is σ = 306225432110. Its totient is φ = 141334814808.

The previous prime is 212002222121. The next prime is 212002222231. The reversal of 212002222221 is 122222200212.

212002222221 is a `hidden beast` number, since 21 + 200 + 2 + 222 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 169320728196 + 42681494025 = 411486^2 + 206595^2 .

It is not a de Polignac number, because 212002222221 - 2⁷ = 212002222093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212002222194 and 212002222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002222231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11777901226 + ... + 11777901243.

Almost surely, 2^212002222221 is an apocalyptic number.

It is an amenable number.

212002222221 is a deficient number, since it is larger than the sum of its proper divisors (94223209889).

212002222221 is a wasteful number, since it uses less digits than its factorization.

212002222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23555802475 (or 23555802472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212002222221 its reverse (122222200212), we get a palindrome (334224422433).

The spelling of 212002222221 in words is "two hundred twelve billion, two million, two hundred twenty-two thousand, two hundred twenty-one".