2661027121 has 4 divisors (see below), whose sum is σ = 2801081200. Its totient is φ = 2520973044.

The previous prime is 2661027107. The next prime is 2661027139. The reversal of 2661027121 is 1217201662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1217201662 = 2 ⋅608600831.

It is a cyclic number.

It is not a de Polignac number, because 2661027121 - 2¹³ = 2661018929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661027121.

It is not an unprimeable number, because it can be changed into a prime (2661027101) 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, 70027011 + ... + 70027048.

It is an arithmetic number, because the mean of its divisors is an integer number (700270300).

Almost surely, 2^2661027121 is an apocalyptic number.

It is an amenable number.

2661027121 is a deficient number, since it is larger than the sum of its proper divisors (140054079).

2661027121 is a wasteful number, since it uses less digits than its factorization.

2661027121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140054078.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2661027121 is about 51585.1443828550. The cubic root of 2661027121 is about 1385.7442981232.

Adding to 2661027121 its reverse (1217201662), we get a palindrome (3878228783).

The spelling of 2661027121 in words is "two billion, six hundred sixty-one million, twenty-seven thousand, one hundred twenty-one".