4204095921 has 9 divisors (see below), whose sum is σ = 6072863979. Its totient is φ = 2802600936.

The previous prime is 4204095919. The next prime is 4204095943. The reversal of 4204095921 is 1295904024.

The square root of 4204095921 is 64839.

It is a perfect power (a square), and thus also a powerful number.

4204095921 is a `hidden beast` number, since 4 + 20 + 40 + 9 + 592 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4200984225 + 3111696 = 64815^2 + 1764^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 4204095921 - 2¹ = 4204095919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4204095911) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 183711 + ... + 205323.

Almost surely, 2^4204095921 is an apocalyptic number.

4204095921 is the 64839-th square number.

4204095921 is the 32420-th centered octagonal number.

It is an amenable number.

4204095921 is a deficient number, since it is larger than the sum of its proper divisors (1868768058).

4204095921 is an frugal number, since it uses more digits than its factorization.

4204095921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43232 (or 21616 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The cubic root of 4204095921 is about 1613.9529578657.

Multiplying 4204095921 by its sum of digits (36), we get a square (151347453156 = 389034²).

Adding to 4204095921 its reverse (1295904024), we get a palindrome (5499999945).

The spelling of 4204095921 in words is "four billion, two hundred four million, ninety-five thousand, nine hundred twenty-one".