2121603621023 has 4 divisors (see below), whose sum is σ = 2124169043400. Its totient is φ = 2119038198648.

The previous prime is 2121603620971. The next prime is 2121603621061. The reversal of 2121603621023 is 3201263061212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121603621023 - 2¹² = 2121603616927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121603621083) 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, 1282709948 + ... + 1282711601.

It is an arithmetic number, because the mean of its divisors is an integer number (531042260850).

Almost surely, 2^{2121603621023} is an apocalyptic number.

2121603621023 is a deficient number, since it is larger than the sum of its proper divisors (2565422377).

2121603621023 is an equidigital number, since it uses as much as digits as its factorization.

2121603621023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565422376.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 2121603621023 its reverse (3201263061212), we get a palindrome (5322866682235).

The spelling of 2121603621023 in words is "two trillion, one hundred twenty-one billion, six hundred three million, six hundred twenty-one thousand, twenty-three".