121212210 has 128 divisors (see below), whose sum is σ = 370759680. Its totient is φ = 24689664.

The previous prime is 121212209. The next prime is 121212253. The reversal of 121212210 is 12212121.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66937 + ... + 68723.

It is an arithmetic number, because the mean of its divisors is an integer number (2896560).

Almost surely, 2^121212210 is an apocalyptic number.

121212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185379840).

121212210 is an abundant number, since it is smaller than the sum of its proper divisors (249547470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121212210 is a wasteful number, since it uses less digits than its factorization.

121212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

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

The square root of 121212210 is about 11009.6416835427. The cubic root of 121212210 is about 494.8977239974.

Adding to 121212210 its reverse (12212121), we get a palindrome (133424331).

The spelling of 121212210 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred ten".