121212247 has 4 divisors (see below), whose sum is σ = 130536280. Its totient is φ = 111888216.

The previous prime is 121212209. The next prime is 121212253. The reversal of 121212247 is 742212121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121212247 - 2²³ = 112823639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212347) 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, 4661997 + ... + 4662022.

It is an arithmetic number, because the mean of its divisors is an integer number (32634070).

Almost surely, 2^121212247 is an apocalyptic number.

121212247 is a deficient number, since it is larger than the sum of its proper divisors (9324033).

121212247 is an equidigital number, since it uses as much as digits as its factorization.

121212247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324032.

The product of its digits is 448, while the sum is 22.

The square root of 121212247 is about 11009.6433638879. The cubic root of 121212247 is about 494.8977743532.

Adding to 121212247 its reverse (742212121), we get a palindrome (863424368).

The spelling of 121212247 in words is "one hundred twenty-one million, two hundred twelve thousand, two hundred forty-seven".