21330677757 has 4 divisors (see below), whose sum is σ = 28440903680. Its totient is φ = 14220451836.

The previous prime is 21330677743. The next prime is 21330677773. The reversal of 21330677757 is 75777603312.

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 not a de Polignac number, because 21330677757 - 2⁷ = 21330677629 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 (21330677737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3555112957 + ... + 3555112962.

It is an arithmetic number, because the mean of its divisors is an integer number (7110225920).

Almost surely, 2^21330677757 is an apocalyptic number.

It is an amenable number.

21330677757 is a deficient number, since it is larger than the sum of its proper divisors (7110225923).

21330677757 is an equidigital number, since it uses as much as digits as its factorization.

21330677757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7110225922.

The product of its (nonzero) digits is 1296540, while the sum is 48.

The spelling of 21330677757 in words is "twenty-one billion, three hundred thirty million, six hundred seventy-seven thousand, seven hundred fifty-seven".