3899572100021 has 16 divisors (see below), whose sum is σ = 4345758572400. Its totient is φ = 3474354551808.

The previous prime is 3899572100009. The next prime is 3899572100063. The reversal of 3899572100021 is 1200012759983.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 44196652900 + 3855375447121 = 210230^2 + 1963511^2 .

It is a cyclic number.

It is not a de Polignac number, because 3899572100021 - 2⁶ = 3899572099957 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 (3899572108021) 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 15 ways as a sum of consecutive naturals, for example, 509726 + ... + 2838831.

It is an arithmetic number, because the mean of its divisors is an integer number (271609910775).

Almost surely, 2^{3899572100021} is an apocalyptic number.

It is an amenable number.

3899572100021 is a deficient number, since it is larger than the sum of its proper divisors (446186472379).

3899572100021 is a wasteful number, since it uses less digits than its factorization.

3899572100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351688.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 3899572100021 in words is "three trillion, eight hundred ninety-nine billion, five hundred seventy-two million, one hundred thousand, twenty-one".