5205436021 has 8 divisors (see below), whose sum is σ = 5393189888. Its totient is φ = 5018922000.

The previous prime is 5205436009. The next prime is 5205436109. The reversal of 5205436021 is 1206345025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5205436021 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 (5205436121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301410 + ... + 318211.

It is an arithmetic number, because the mean of its divisors is an integer number (674148736).

Almost surely, 2^5205436021 is an apocalyptic number.

It is an amenable number.

5205436021 is a deficient number, since it is larger than the sum of its proper divisors (187753867).

5205436021 is a wasteful number, since it uses less digits than its factorization.

5205436021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619923.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 5205436021 is about 72148.7076876641. The cubic root of 5205436021 is about 1733.0817047902.

The spelling of 5205436021 in words is "five billion, two hundred five million, four hundred thirty-six thousand, twenty-one".