210212121217 has 4 divisors (see below), whose sum is σ = 240242424256. Its totient is φ = 180181818180.

The previous prime is 210212121209. The next prime is 210212121257. The reversal of 210212121217 is 712121212012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 210212121217 - 2³ = 210212121209 is a prime.

It is a super-2 number, since 2×210212121217² (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 (210212121257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15015151509 + ... + 15015151522.

It is an arithmetic number, because the mean of its divisors is an integer number (60060606064).

Almost surely, 2^210212121217 is an apocalyptic number.

It is an amenable number.

210212121217 is a deficient number, since it is larger than the sum of its proper divisors (30030303039).

210212121217 is an equidigital number, since it uses as much as digits as its factorization.

210212121217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30030303038.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 210212121217 its reverse (712121212012), we get a palindrome (922333333229).

The spelling of 210212121217 in words is "two hundred ten billion, two hundred twelve million, one hundred twenty-one thousand, two hundred seventeen".