121215153 has 4 divisors (see below), whose sum is σ = 161620208. Its totient is φ = 80810100.

The previous prime is 121215139. The next prime is 121215161. The reversal of 121215153 is 351512121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121215153 - 2²⁴ = 104437937 is a prime.

It is a super-2 number, since 2×121215153² = 29386226633626818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121215103) 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, 20202523 + ... + 20202528.

It is an arithmetic number, because the mean of its divisors is an integer number (40405052).

Almost surely, 2^121215153 is an apocalyptic number.

It is an amenable number.

121215153 is a deficient number, since it is larger than the sum of its proper divisors (40405055).

121215153 is an equidigital number, since it uses as much as digits as its factorization.

121215153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40405054.

The product of its digits is 300, while the sum is 21.

The square root of 121215153 is about 11009.7753383073. The cubic root of 121215153 is about 494.9017292931.

Adding to 121215153 its reverse (351512121), we get a palindrome (472727274).

The spelling of 121215153 in words is "one hundred twenty-one million, two hundred fifteen thousand, one hundred fifty-three".