21365560614757 has 4 divisors (see below), whose sum is σ = 22622358297996. Its totient is φ = 20108762931520.

The previous prime is 21365560614703. The next prime is 21365560614793. The reversal of 21365560614757 is 75741606556312.

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 17808813562401 + 3556747052356 = 4220049^2 + 1885934^2 .

It is a cyclic number.

It is not a de Polignac number, because 21365560614757 - 2¹¹ = 21365560612709 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 (21365560614457) 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, 628398841594 + ... + 628398841627.

It is an arithmetic number, because the mean of its divisors is an integer number (5655589574499).

Almost surely, 2^{21365560614757} is an apocalyptic number.

It is an amenable number.

21365560614757 is a deficient number, since it is larger than the sum of its proper divisors (1256797683239).

21365560614757 is a wasteful number, since it uses less digits than its factorization.

21365560614757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256797683238.

The product of its (nonzero) digits is 31752000, while the sum is 58.

The spelling of 21365560614757 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty million, six hundred fourteen thousand, seven hundred fifty-seven".