2121011623 has 2 divisors, whose sum is σ = 2121011624. Its totient is φ = 2121011622.

The previous prime is 2121011617. The next prime is 2121011639. The reversal of 2121011623 is 3261101212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121011623 - 2⁹ = 2121011111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121011623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121012623) 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 as a sum of consecutive naturals, namely, 1060505811 + 1060505812.

It is an arithmetic number, because the mean of its divisors is an integer number (1060505812).

Almost surely, 2^2121011623 is an apocalyptic number.

2121011623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121011623 is an equidigital number, since it uses as much as digits as its factorization.

2121011623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2121011623 is about 46054.4419464616. The cubic root of 2121011623 is about 1284.8359590140.

Adding to 2121011623 its reverse (3261101212), we get a palindrome (5382112835).

The spelling of 2121011623 in words is "two billion, one hundred twenty-one million, eleven thousand, six hundred twenty-three".