21956753071915 has 8 divisors (see below), whose sum is σ = 26348258013840. Its totient is φ = 17565299572512.

The previous prime is 21956753071837. The next prime is 21956753071933. The reversal of 21956753071915 is 51917035765912.

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

It is a cyclic number.

It is not a de Polignac number, because 21956753071915 - 2³⁹ = 21406997258027 is a prime.

It is a super-2 number, since 2×21956753071915² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11915305 + ... + 13634074.

It is an arithmetic number, because the mean of its divisors is an integer number (3293532251730).

Almost surely, 2^{21956753071915} is an apocalyptic number.

21956753071915 is a deficient number, since it is larger than the sum of its proper divisors (4391504941925).

21956753071915 is a wasteful number, since it uses less digits than its factorization.

21956753071915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25721261.

The product of its (nonzero) digits is 17860500, while the sum is 61.

The spelling of 21956753071915 in words is "twenty-one trillion, nine hundred fifty-six billion, seven hundred fifty-three million, seventy-one thousand, nine hundred fifteen".