121515420453 has 64 divisors (see below), whose sum is σ = 199472232960. Its totient is φ = 64217088000.

The previous prime is 121515420407. The next prime is 121515420457. The reversal of 121515420453 is 354024515121.

It is not a de Polignac number, because 121515420453 - 2⁹ = 121515419941 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 (121515420457) 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 63 ways as a sum of consecutive naturals, for example, 28329733 + ... + 28334021.

It is an arithmetic number, because the mean of its divisors is an integer number (3116753640).

Almost surely, 2^121515420453 is an apocalyptic number.

It is an amenable number.

121515420453 is a deficient number, since it is larger than the sum of its proper divisors (77956812507).

121515420453 is a wasteful number, since it uses less digits than its factorization.

121515420453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5678.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 121515420453 its reverse (354024515121), we get a palindrome (475539935574).

The spelling of 121515420453 in words is "one hundred twenty-one billion, five hundred fifteen million, four hundred twenty thousand, four hundred fifty-three".