1242205554217 has 4 divisors (see below), whose sum is σ = 1242367286356. Its totient is φ = 1242043822080.

The previous prime is 1242205554211. The next prime is 1242205554253. The reversal of 1242205554217 is 7124555022421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 821725933081 + 420479621136 = 906491^2 + 648444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242205554217 - 2³⁵ = 1207845815849 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 1242205554217.

It is not an unprimeable number, because it can be changed into a prime (1242205554211) 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, 80854548 + ... + 80869909.

It is an arithmetic number, because the mean of its divisors is an integer number (310591821589).

Almost surely, 2^{1242205554217} is an apocalyptic number.

It is an amenable number.

1242205554217 is a deficient number, since it is larger than the sum of its proper divisors (161732139).

1242205554217 is an equidigital number, since it uses as much as digits as its factorization.

1242205554217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161732138.

The product of its (nonzero) digits is 224000, while the sum is 40.

The spelling of 1242205554217 in words is "one trillion, two hundred forty-two billion, two hundred five million, five hundred fifty-four thousand, two hundred seventeen".