4099500021 has 16 divisors (see below), whose sum is σ = 5862248640. Its totient is φ = 2540304000.

The previous prime is 4099500017. The next prime is 4099500023. The reversal of 4099500021 is 1200059904.

It is a happy number.

It is not a de Polignac number, because 4099500021 - 2² = 4099500017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4099500023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675480 + ... + 681521.

It is an arithmetic number, because the mean of its divisors is an integer number (366390540).

Almost surely, 2^4099500021 is an apocalyptic number.

It is an amenable number.

4099500021 is a deficient number, since it is larger than the sum of its proper divisors (1762748619).

4099500021 is a wasteful number, since it uses less digits than its factorization.

4099500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357076.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 4099500021 is about 64027.3380752316. The cubic root of 4099500021 is about 1600.4556021554.

Adding to 4099500021 its reverse (1200059904), we get a palindrome (5299559925).

The spelling of 4099500021 in words is "four billion, ninety-nine million, five hundred thousand, twenty-one".