4102123021 has 4 divisors (see below), whose sum is σ = 4202174844. Its totient is φ = 4002071200.

The previous prime is 4102122989. The next prime is 4102123043. The reversal of 4102123021 is 1203212014.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203212014 = 2 ⋅601606007.

It can be written as a sum of positive squares in 2 ways, for example, as 1067655625 + 3034467396 = 32675^2 + 55086^2 .

It is a cyclic number.

It is not a de Polignac number, because 4102123021 - 2⁵ = 4102122989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4102122986 and 4102123004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4102123121) 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, 50025850 + ... + 50025931.

It is an arithmetic number, because the mean of its divisors is an integer number (1050543711).

Almost surely, 2^4102123021 is an apocalyptic number.

4102123021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4102123021 is a deficient number, since it is larger than the sum of its proper divisors (100051823).

4102123021 is a wasteful number, since it uses less digits than its factorization.

4102123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100051822.

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

The square root of 4102123021 is about 64047.8182376262. The cubic root of 4102123021 is about 1600.7968714160.

Adding to 4102123021 its reverse (1203212014), we get a palindrome (5305335035).

The spelling of 4102123021 in words is "four billion, one hundred two million, one hundred twenty-three thousand, twenty-one".