2104123021 has 16 divisors (see below), whose sum is σ = 2825117568. Its totient is φ = 1513454400.

The previous prime is 2104122989. The next prime is 2104123093. The reversal of 2104123021 is 1203214012.

It is a cyclic number.

It is not a de Polignac number, because 2104123021 - 2⁵ = 2104122989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2104122986 and 2104123004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104123121) 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 15 ways as a sum of consecutive naturals, for example, 1050010 + ... + 1052011.

It is an arithmetic number, because the mean of its divisors is an integer number (176569848).

Almost surely, 2^2104123021 is an apocalyptic number.

It is an amenable number.

2104123021 is a deficient number, since it is larger than the sum of its proper divisors (720994547).

2104123021 is a wasteful number, since it uses less digits than its factorization.

2104123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102052.

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

The square root of 2104123021 is about 45870.7207377429. The cubic root of 2104123021 is about 1281.4166892993.

Adding to 2104123021 its reverse (1203214012), we get a palindrome (3307337033).

Subtracting from 2104123021 its reverse (1203214012), we obtain a palindrome (900909009).

The spelling of 2104123021 in words is "two billion, one hundred four million, one hundred twenty-three thousand, twenty-one".