1242221638171 has 4 divisors (see below), whose sum is σ = 1242256771512. Its totient is φ = 1242186504832.

The previous prime is 1242221638169. The next prime is 1242221638213. The reversal of 1242221638171 is 1718361222421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242221638171 - 2¹ = 1242221638169 is a prime.

It is a super-2 number, since 2×1242221638171² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242221638121) 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, 17513581 + ... + 17584366.

It is an arithmetic number, because the mean of its divisors is an integer number (310564192878).

Almost surely, 2^{1242221638171} is an apocalyptic number.

1242221638171 is a deficient number, since it is larger than the sum of its proper divisors (35133341).

1242221638171 is an equidigital number, since it uses as much as digits as its factorization.

1242221638171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35133340.

The product of its digits is 64512, while the sum is 40.

The spelling of 1242221638171 in words is "one trillion, two hundred forty-two billion, two hundred twenty-one million, six hundred thirty-eight thousand, one hundred seventy-one".