1261112120201 has 4 divisors (see below), whose sum is σ = 1261392808452. Its totient is φ = 1260831431952.

The previous prime is 1261112120171. The next prime is 1261112120231. The reversal of 1261112120201 is 1020212111621.

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

It is an interprime number because it is at equal distance from previous prime (1261112120171) and next prime (1261112120231).

It can be written as a sum of positive squares in 2 ways, for example, as 629920005625 + 631192114576 = 793675^2 + 794476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261112120201 is a prime.

It is a super-2 number, since 2×1261112120201² (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 (1261112120231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140337386 + ... + 140346371.

It is an arithmetic number, because the mean of its divisors is an integer number (315348202113).

Almost surely, 2^{1261112120201} is an apocalyptic number.

It is an amenable number.

1261112120201 is a deficient number, since it is larger than the sum of its proper divisors (280688251).

1261112120201 is an equidigital number, since it uses as much as digits as its factorization.

1261112120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280688250.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1261112120201 its reverse (1020212111621), we get a palindrome (2281324231822).

The spelling of 1261112120201 in words is "one trillion, two hundred sixty-one billion, one hundred twelve million, one hundred twenty thousand, two hundred one".