2121020121223 has 4 divisors (see below), whose sum is σ = 2124298360080. Its totient is φ = 2117741882368.

The previous prime is 2121020121173. The next prime is 2121020121229. The reversal of 2121020121223 is 3221210201212.

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 2121020121223 - 2¹³ = 2121020113031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020121223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020121229) 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, 1639118458 + ... + 1639119751.

It is an arithmetic number, because the mean of its divisors is an integer number (531074590020).

Almost surely, 2^{2121020121223} is an apocalyptic number.

2121020121223 is a deficient number, since it is larger than the sum of its proper divisors (3278238857).

2121020121223 is an equidigital number, since it uses as much as digits as its factorization.

2121020121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278238856.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2121020121223 its reverse (3221210201212), we get a palindrome (5342230322435).

The spelling of 2121020121223 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred twenty-one thousand, two hundred twenty-three".