2121201110023 has 4 divisors (see below), whose sum is σ = 2130713222848. Its totient is φ = 2111688997200.

The previous prime is 2121201109981. The next prime is 2121201110051. The reversal of 2121201110023 is 3200111021212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121201110023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121201109979 and 2121201110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201110923) 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, 4756056078 + ... + 4756056523.

It is an arithmetic number, because the mean of its divisors is an integer number (532678305712).

Almost surely, 2^{2121201110023} is an apocalyptic number.

2121201110023 is a deficient number, since it is larger than the sum of its proper divisors (9512112825).

2121201110023 is an equidigital number, since it uses as much as digits as its factorization.

2121201110023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9512112824.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2121201110023 its reverse (3200111021212), we get a palindrome (5321312131235).

The spelling of 2121201110023 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred ten thousand, twenty-three".