1201242101 has 4 divisors (see below), whose sum is σ = 1201316652. Its totient is φ = 1201167552.

The previous prime is 1201242071. The next prime is 1201242131. The reversal of 1201242101 is 1012421021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (1201242071) and next prime (1201242131).

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 1195361476 = 2425^2 + 34574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201242101 - 2¹⁸ = 1200979957 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 (1201242131) 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, 1940 + ... + 49053.

It is an arithmetic number, because the mean of its divisors is an integer number (300329163).

Almost surely, 2^1201242101 is an apocalyptic number.

It is an amenable number.

1201242101 is a deficient number, since it is larger than the sum of its proper divisors (74551).

1201242101 is an equidigital number, since it uses as much as digits as its factorization.

1201242101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74550.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1201242101 is about 34658.9396981500. The cubic root of 1201242101 is about 1063.0250897716.

Adding to 1201242101 its reverse (1012421021), we get a palindrome (2213663122).

It can be divided in two parts, 1 and 201242101, that added together give a palindrome (201242102).

The spelling of 1201242101 in words is "one billion, two hundred one million, two hundred forty-two thousand, one hundred one".