121531416653 has 4 divisors (see below), whose sum is σ = 122734698108. Its totient is φ = 120328135200.

The previous prime is 121531416577. The next prime is 121531416659. The reversal of 121531416653 is 356614135121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356614135121 = 101 ⋅3530833021.

It can be written as a sum of positive squares in 2 ways, for example, as 56329326244 + 65202090409 = 237338^2 + 255347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121531416653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531416659) 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 3 ways as a sum of consecutive naturals, for example, 601640576 + ... + 601640777.

It is an arithmetic number, because the mean of its divisors is an integer number (30683674527).

Almost surely, 2^121531416653 is an apocalyptic number.

It is an amenable number.

121531416653 is a deficient number, since it is larger than the sum of its proper divisors (1203281455).

121531416653 is a wasteful number, since it uses less digits than its factorization.

121531416653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203281454.

The product of its digits is 64800, while the sum is 38.

The spelling of 121531416653 in words is "one hundred twenty-one billion, five hundred thirty-one million, four hundred sixteen thousand, six hundred fifty-three".