1242100154203 has 4 divisors (see below), whose sum is σ = 1242313322920. Its totient is φ = 1241886985488.

The previous prime is 1242100154173. The next prime is 1242100154209. The reversal of 1242100154203 is 3024510012421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242100154203 is a prime.

It is a super-2 number, since 2×1242100154203² (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 (1242100154209) 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, 106575618 + ... + 106587271.

It is an arithmetic number, because the mean of its divisors is an integer number (310578330730).

Almost surely, 2^{1242100154203} is an apocalyptic number.

1242100154203 is a deficient number, since it is larger than the sum of its proper divisors (213168717).

1242100154203 is an equidigital number, since it uses as much as digits as its factorization.

1242100154203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213168716.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 1242100154203 its reverse (3024510012421), we get a palindrome (4266610166624).

The spelling of 1242100154203 in words is "one trillion, two hundred forty-two billion, one hundred million, one hundred fifty-four thousand, two hundred three".