2121012021223 has 4 divisors (see below), whose sum is σ = 2121267234928. Its totient is φ = 2120756807520.

The previous prime is 2121012021209. The next prime is 2121012021259. The reversal of 2121012021223 is 3221202101212.

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-2121012021223 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 2121012021223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012021823) 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, 127594386 + ... + 127611007.

It is an arithmetic number, because the mean of its divisors is an integer number (530316808732).

Almost surely, 2^{2121012021223} is an apocalyptic number.

2121012021223 is a deficient number, since it is larger than the sum of its proper divisors (255213705).

2121012021223 is an equidigital number, since it uses as much as digits as its factorization.

2121012021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255213704.

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

Adding to 2121012021223 its reverse (3221202101212), we get a palindrome (5342214122435).

The spelling of 2121012021223 in words is "two trillion, one hundred twenty-one billion, twelve million, twenty-one thousand, two hundred twenty-three".