7217121313553 has 4 divisors (see below), whose sum is σ = 7596969803760. Its totient is φ = 6837272823348.

The previous prime is 7217121313537. The next prime is 7217121313583. The reversal of 7217121313553 is 3553131217127.

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 a cyclic number.

It is not a de Polignac number, because 7217121313553 - 2⁴ = 7217121313537 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 7217121313553.

It is not an unprimeable number, because it can be changed into a prime (7217121313583) 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, 189924245075 + ... + 189924245112.

It is an arithmetic number, because the mean of its divisors is an integer number (1899242450940).

Almost surely, 2^{7217121313553} is an apocalyptic number.

It is an amenable number.

7217121313553 is a deficient number, since it is larger than the sum of its proper divisors (379848490207).

7217121313553 is a wasteful number, since it uses less digits than its factorization.

7217121313553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379848490206.

The product of its digits is 132300, while the sum is 41.

The spelling of 7217121313553 in words is "seven trillion, two hundred seventeen billion, one hundred twenty-one million, three hundred thirteen thousand, five hundred fifty-three".