2121210023 has 4 divisors (see below), whose sum is σ = 2121385128. Its totient is φ = 2121034920.

The previous prime is 2121210019. The next prime is 2121210059. The reversal of 2121210023 is 3200121212.

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 2121210023 - 2² = 2121210019 is a prime.

It is a super-3 number, since 3×2121210023³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121210083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67913 + ... + 94098.

It is an arithmetic number, because the mean of its divisors is an integer number (530346282).

Almost surely, 2^2121210023 is an apocalyptic number.

2121210023 is a deficient number, since it is larger than the sum of its proper divisors (175105).

2121210023 is a wasteful number, since it uses less digits than its factorization.

2121210023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175104.

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

The square root of 2121210023 is about 46056.5958685615. The cubic root of 2121210023 is about 1284.8760190658.

Adding to 2121210023 its reverse (3200121212), we get a palindrome (5321331235).

The spelling of 2121210023 in words is "two billion, one hundred twenty-one million, two hundred ten thousand, twenty-three".