21772859365 has 8 divisors (see below), whose sum is σ = 26386119288. Its totient is φ = 17245828800.

The previous prime is 21772859359. The next prime is 21772859371. The reversal of 21772859365 is 56395827712.

It is an interprime number because it is at equal distance from previous prime (21772859359) and next prime (21772859371).

It can be written as a sum of positive squares in 4 ways, for example, as 8177765761 + 13595093604 = 90431^2 + 116598^2 .

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

It is not a de Polignac number, because 21772859365 - 2¹³ = 21772851173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21556782 + ... + 21557791.

It is an arithmetic number, because the mean of its divisors is an integer number (3298264911).

Almost surely, 2^21772859365 is an apocalyptic number.

It is an amenable number.

21772859365 is a deficient number, since it is larger than the sum of its proper divisors (4613259923).

21772859365 is a wasteful number, since it uses less digits than its factorization.

21772859365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43114679.

The product of its digits is 6350400, while the sum is 55.

The spelling of 21772859365 in words is "twenty-one billion, seven hundred seventy-two million, eight hundred fifty-nine thousand, three hundred sixty-five".