21754227765 has 16 divisors (see below), whose sum is σ = 36006998400. Its totient is φ = 11202176832.

The previous prime is 21754227757. The next prime is 21754227797. The reversal of 21754227765 is 56772245712.

It is a happy number.

It is not a de Polignac number, because 21754227765 - 2³ = 21754227757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25004425 + ... + 25005294.

It is an arithmetic number, because the mean of its divisors is an integer number (2250437400).

Almost surely, 2^21754227765 is an apocalyptic number.

It is an amenable number.

21754227765 is a deficient number, since it is larger than the sum of its proper divisors (14252770635).

21754227765 is a wasteful number, since it uses less digits than its factorization.

21754227765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50009756.

The product of its digits is 1646400, while the sum is 48.

The spelling of 21754227765 in words is "twenty-one billion, seven hundred fifty-four million, two hundred twenty-seven thousand, seven hundred sixty-five".