210212121 has 8 divisors (see below), whose sum is σ = 320323264. Its totient is φ = 120121200.

The previous prime is 210212047. The next prime is 210212131. The reversal of 210212121 is 121212012.

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

It is not a de Polignac number, because 210212121 - 2⁹ = 210211609 is a prime.

It is a Duffinian number.

210212121 is a modest number, since divided by 212121 gives 210 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210212097 and 210212106.

It is not an unprimeable number, because it can be changed into a prime (210212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5005030 + ... + 5005071.

It is an arithmetic number, because the mean of its divisors is an integer number (40040408).

Almost surely, 2^210212121 is an apocalyptic number.

210212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210212121 is a deficient number, since it is larger than the sum of its proper divisors (110111143).

210212121 is a wasteful number, since it uses less digits than its factorization.

210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010111.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 210212121 is about 14498.6937687503. The cubic root of 210212121 is about 594.5922597819.

Adding to 210212121 its reverse (121212012), we get a palindrome (331424133).

The spelling of 210212121 in words is "two hundred ten million, two hundred twelve thousand, one hundred twenty-one".