212102021221 has 8 divisors (see below), whose sum is σ = 212448074400. Its totient is φ = 211756073232.

The previous prime is 212102021213. The next prime is 212102021231. The reversal of 212102021221 is 122120201212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212102021221 - 2³ = 212102021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212102021195 and 212102021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102021231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4689511 + ... + 4734523.

It is an arithmetic number, because the mean of its divisors is an integer number (26556009300).

Almost surely, 2^212102021221 is an apocalyptic number.

It is an amenable number.

212102021221 is a deficient number, since it is larger than the sum of its proper divisors (346053179).

212102021221 is an equidigital number, since it uses as much as digits as its factorization.

212102021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52595.

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

Adding to 212102021221 its reverse (122120201212), we get a palindrome (334222222433).

The spelling of 212102021221 in words is "two hundred twelve billion, one hundred two million, twenty-one thousand, two hundred twenty-one".