2121201020723 has 2 divisors, whose sum is σ = 2121201020724. Its totient is φ = 2121201020722.

The previous prime is 2121201020683. The next prime is 2121201020747. The reversal of 2121201020723 is 3270201021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121201020723 - 2²⁶ = 2121133911859 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2121201020773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600510361 + 1060600510362.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600510362).

Almost surely, 2^{2121201020723} is an apocalyptic number.

2121201020723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121201020723 is an equidigital number, since it uses as much as digits as its factorization.

2121201020723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 2121201020723 its reverse (3270201021212), we get a palindrome (5391402041935).

The spelling of 2121201020723 in words is "two trillion, one hundred twenty-one billion, two hundred one million, twenty thousand, seven hundred twenty-three".