121500455 has 4 divisors (see below), whose sum is σ = 145800552. Its totient is φ = 97200360.

The previous prime is 121500389. The next prime is 121500461. The reversal of 121500455 is 554005121.

It is a happy number.

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

It is not a de Polignac number, because 121500455 - 2¹⁰ = 121499431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121500455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12150041 + ... + 12150050.

It is an arithmetic number, because the mean of its divisors is an integer number (36450138).

Almost surely, 2^121500455 is an apocalyptic number.

121500455 is a deficient number, since it is larger than the sum of its proper divisors (24300097).

121500455 is an equidigital number, since it uses as much as digits as its factorization.

121500455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24300096.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 121500455 is about 11022.7244817241. The cubic root of 121500455 is about 495.2897055955.

Adding to 121500455 its reverse (554005121), we get a palindrome (675505576).

The spelling of 121500455 in words is "one hundred twenty-one million, five hundred thousand, four hundred fifty-five".