21770338361 has 4 divisors (see below), whose sum is σ = 21774380532. Its totient is φ = 21766296192.

The previous prime is 21770338307. The next prime is 21770338393. The reversal of 21770338361 is 16383307712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20427555625 + 1342782736 = 142925^2 + 36644^2 .

It is a cyclic number.

It is not a de Polignac number, because 21770338361 - 2²⁶ = 21703229497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21770338661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012996 + ... + 2023781.

It is an arithmetic number, because the mean of its divisors is an integer number (5443595133).

Almost surely, 2^21770338361 is an apocalyptic number.

It is an amenable number.

21770338361 is a deficient number, since it is larger than the sum of its proper divisors (4042171).

21770338361 is an equidigital number, since it uses as much as digits as its factorization.

21770338361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042170.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 21770338361 in words is "twenty-one billion, seven hundred seventy million, three hundred thirty-eight thousand, three hundred sixty-one".