121212215 has 16 divisors (see below), whose sum is σ = 147666240. Its totient is φ = 95504640.

The previous prime is 121212209. The next prime is 121212253. The reversal of 121212215 is 512212121.

It is not a de Polignac number, because 121212215 - 2²² = 117017911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212193 and 121212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187022 + ... + 187668.

It is an arithmetic number, because the mean of its divisors is an integer number (9229140).

Almost surely, 2^121212215 is an apocalyptic number.

121212215 is a deficient number, since it is larger than the sum of its proper divisors (26454025).

121212215 is an equidigital number, since it uses as much as digits as its factorization.

121212215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 80, while the sum is 17.

The square root of 121212215 is about 11009.6419106163. The cubic root of 121212215 is about 494.8977308023.

Adding to 121212215 its reverse (512212121), we get a palindrome (633424336).

The spelling of 121212215 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred fifteen".