2121201023 has 4 divisors (see below), whose sum is σ = 2123779248. Its totient is φ = 2118622800.

The previous prime is 2121200987. The next prime is 2121201029. The reversal of 2121201023 is 3201021212.

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 2121201023 - 2¹⁰ = 2121199999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121200989 and 2121201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201029) 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, 1287878 + ... + 1289523.

It is an arithmetic number, because the mean of its divisors is an integer number (530944812).

Almost surely, 2^2121201023 is an apocalyptic number.

2121201023 is a deficient number, since it is larger than the sum of its proper divisors (2578225).

2121201023 is an equidigital number, since it uses as much as digits as its factorization.

2121201023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2578224.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2121201023 is about 46056.4981625829. The cubic root of 2121201023 is about 1284.8742018796.

Adding to 2121201023 its reverse (3201021212), we get a palindrome (5322222235).

The spelling of 2121201023 in words is "two billion, one hundred twenty-one million, two hundred one thousand, twenty-three".