2123013231021 has 4 divisors (see below), whose sum is σ = 2830684308032. Its totient is φ = 1415342154012.

The previous prime is 2123013231011. The next prime is 2123013231023. The reversal of 2123013231021 is 1201323103212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2123013231021 - 2¹⁸ = 2123012968877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123013231023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353835538501 + ... + 353835538506.

It is an arithmetic number, because the mean of its divisors is an integer number (707671077008).

Almost surely, 2^{2123013231021} is an apocalyptic number.

It is an amenable number.

2123013231021 is a deficient number, since it is larger than the sum of its proper divisors (707671077011).

2123013231021 is an equidigital number, since it uses as much as digits as its factorization.

2123013231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707671077010.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 2123013231021 its reverse (1201323103212), we get a palindrome (3324336334233).

The spelling of 2123013231021 in words is "two trillion, one hundred twenty-three billion, thirteen million, two hundred thirty-one thousand, twenty-one".