121243215 has 8 divisors (see below), whose sum is σ = 193989168. Its totient is φ = 64663040.

The previous prime is 121243193. The next prime is 121243223. The reversal of 121243215 is 512342121.

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

It is not a de Polignac number, because 121243215 - 2⁵ = 121243183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121243191 and 121243200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4041426 + ... + 4041455.

It is an arithmetic number, because the mean of its divisors is an integer number (24248646).

Almost surely, 2^121243215 is an apocalyptic number.

121243215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121243215 is a deficient number, since it is larger than the sum of its proper divisors (72745953).

121243215 is an equidigital number, since it uses as much as digits as its factorization.

121243215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8082889.

The product of its digits is 480, while the sum is 21.

The square root of 121243215 is about 11011.0496774831. The cubic root of 121243215 is about 494.9399172050.

Adding to 121243215 its reverse (512342121), we get a palindrome (633585336).

The spelling of 121243215 in words is "one hundred twenty-one million, two hundred forty-three thousand, two hundred fifteen".