121215453 has 8 divisors (see below), whose sum is σ = 163221216. Its totient is φ = 80010000.

The previous prime is 121215433. The next prime is 121215463. The reversal of 121215453 is 354512121.

It is a happy number.

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

It is not a de Polignac number, because 121215453 - 2²⁶ = 54106589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199723 + ... + 200328.

It is an arithmetic number, because the mean of its divisors is an integer number (20402652).

Almost surely, 2^121215453 is an apocalyptic number.

It is an amenable number.

121215453 is a deficient number, since it is larger than the sum of its proper divisors (42005763).

121215453 is a wasteful number, since it uses less digits than its factorization.

121215453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400155.

The product of its digits is 1200, while the sum is 24.

The square root of 121215453 is about 11009.7889625551. The cubic root of 121215453 is about 494.9021375765.

Adding to 121215453 its reverse (354512121), we get a palindrome (475727574).

The spelling of 121215453 in words is "one hundred twenty-one million, two hundred fifteen thousand, four hundred fifty-three".