1242100001 has 4 divisors (see below), whose sum is σ = 1242352404. Its totient is φ = 1241847600.

The previous prime is 1242099979. The next prime is 1242100007. The reversal of 1242100001 is 1000012421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000012421 = 1933 ⋅517337.

It can be written as a sum of positive squares in 2 ways, for example, as 803155600 + 438944401 = 28340^2 + 20951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242100001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242100007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118670 + ... + 128711.

It is an arithmetic number, because the mean of its divisors is an integer number (310588101).

Almost surely, 2^1242100001 is an apocalyptic number.

It is an amenable number.

1242100001 is a deficient number, since it is larger than the sum of its proper divisors (252403).

1242100001 is an equidigital number, since it uses as much as digits as its factorization.

1242100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252402.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1242100001 is about 35243.4391199270. The cubic root of 1242100001 is about 1074.9432098357.

Adding to 1242100001 its reverse (1000012421), we get a palindrome (2242112422).

The spelling of 1242100001 in words is "one billion, two hundred forty-two million, one hundred thousand, one".