1242011101 has 4 divisors (see below), whose sum is σ = 1284839100. Its totient is φ = 1199183104.

The previous prime is 1242011083. The next prime is 1242011107. The reversal of 1242011101 is 1011102421.

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 473280025 + 768731076 = 21755^2 + 27726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242011101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242011107) 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, 21413956 + ... + 21414013.

It is an arithmetic number, because the mean of its divisors is an integer number (321209775).

Almost surely, 2^1242011101 is an apocalyptic number.

It is an amenable number.

1242011101 is a deficient number, since it is larger than the sum of its proper divisors (42827999).

1242011101 is an equidigital number, since it uses as much as digits as its factorization.

1242011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42827998.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1242011101 is about 35242.1778697061. The cubic root of 1242011101 is about 1074.9175638246.

Adding to 1242011101 its reverse (1011102421), we get a palindrome (2253113522).

The spelling of 1242011101 in words is "one billion, two hundred forty-two million, eleven thousand, one hundred one".