2643022121 has 4 divisors (see below), whose sum is σ = 2643148500. Its totient is φ = 2642895744.

The previous prime is 2643022117. The next prime is 2643022153. The reversal of 2643022121 is 1212203462.

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 can be written as a sum of positive squares in 2 ways, for example, as 82156096 + 2560866025 = 9064^2 + 50605^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643022121 - 2² = 2643022117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643022321) 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, 23516 + ... + 76413.

It is an arithmetic number, because the mean of its divisors is an integer number (660787125).

Almost surely, 2^2643022121 is an apocalyptic number.

It is an amenable number.

2643022121 is a deficient number, since it is larger than the sum of its proper divisors (126379).

2643022121 is an equidigital number, since it uses as much as digits as its factorization.

2643022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126378.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 2643022121 is about 51410.3308781416. The cubic root of 2643022121 is about 1382.6118220436.

Adding to 2643022121 its reverse (1212203462), we get a palindrome (3855225583).

The spelling of 2643022121 in words is "two billion, six hundred forty-three million, twenty-two thousand, one hundred twenty-one".