2123004100021 has 4 divisors (see below), whose sum is σ = 2426290400032. Its totient is φ = 1819717800012.

The previous prime is 2123004100013. The next prime is 2123004100027. The reversal of 2123004100021 is 1200014003212.

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 2123004100021 - 2³ = 2123004100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123004099968 and 2123004100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123004100027) 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, 151643149995 + ... + 151643150008.

It is an arithmetic number, because the mean of its divisors is an integer number (606572600008).

Almost surely, 2^{2123004100021} is an apocalyptic number.

It is an amenable number.

2123004100021 is a deficient number, since it is larger than the sum of its proper divisors (303286300011).

2123004100021 is an equidigital number, since it uses as much as digits as its factorization.

2123004100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303286300010.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2123004100021 its reverse (1200014003212), we get a palindrome (3323018103233).

The spelling of 2123004100021 in words is "two trillion, one hundred twenty-three billion, four million, one hundred thousand, twenty-one".