2121201020023 has 2 divisors, whose sum is σ = 2121201020024. Its totient is φ = 2121201020022.

The previous prime is 2121201019921. The next prime is 2121201020143. The reversal of 2121201020023 is 3200201021212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121201020023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121201019979 and 2121201020006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121201020723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600510011 + 1060600510012.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600510012).

Almost surely, 2^{2121201020023} is an apocalyptic number.

2121201020023 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121201020023 is an equidigital number, since it uses as much as digits as its factorization.

2121201020023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2121201020023 its reverse (3200201021212), we get a palindrome (5321402041235).

The spelling of 2121201020023 in words is "two trillion, one hundred twenty-one billion, two hundred one million, twenty thousand, twenty-three".