5266780021 has 4 divisors (see below), whose sum is σ = 5270323392. Its totient is φ = 5263236652.

The previous prime is 5266780007. The next prime is 5266780027. The reversal of 5266780021 is 1200876625.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5266780021 - 2²¹ = 5264682869 is a prime.

It is a super-3 number, since 3×5266780021³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5266780027) 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, 1769455 + ... + 1772428.

It is an arithmetic number, because the mean of its divisors is an integer number (1317580848).

Almost surely, 2^5266780021 is an apocalyptic number.

It is an amenable number.

5266780021 is a deficient number, since it is larger than the sum of its proper divisors (3543371).

5266780021 is a wasteful number, since it uses less digits than its factorization.

5266780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543370.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 5266780021 is about 72572.5844999336. The cubic root of 5266780021 is about 1739.8630293599.

The spelling of 5266780021 in words is "five billion, two hundred sixty-six million, seven hundred eighty thousand, twenty-one".