21756073714215 has 8 divisors (see below), whose sum is σ = 34809717942768. Its totient is φ = 11603239314240.

The previous prime is 21756073714201. The next prime is 21756073714217. The reversal of 21756073714215 is 51241737065712.

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

It is not a de Polignac number, because 21756073714215 - 2⁵ = 21756073714183 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21756073714217) 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 7 ways as a sum of consecutive naturals, for example, 725202457126 + ... + 725202457155.

It is an arithmetic number, because the mean of its divisors is an integer number (4351214742846).

Almost surely, 2^{21756073714215} is an apocalyptic number.

21756073714215 is a deficient number, since it is larger than the sum of its proper divisors (13053644228553).

21756073714215 is a wasteful number, since it uses less digits than its factorization.

21756073714215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450404914289.

The product of its (nonzero) digits is 2469600, while the sum is 51.

The spelling of 21756073714215 in words is "twenty-one trillion, seven hundred fifty-six billion, seventy-three million, seven hundred fourteen thousand, two hundred fifteen".