21571657006115 has 8 divisors (see below), whose sum is σ = 26020112700768. Its totient is φ = 17167909409280.

The previous prime is 21571657006061. The next prime is 21571657006121. The reversal of 21571657006115 is 51160075617512.

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

It is not a de Polignac number, because 21571657006115 - 2³⁸ = 21296779099171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21571657006115.

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, 11177023391 + ... + 11177025320.

It is an arithmetic number, because the mean of its divisors is an integer number (3252514087596).

Almost surely, 2^{21571657006115} is an apocalyptic number.

21571657006115 is a deficient number, since it is larger than the sum of its proper divisors (4448455694653).

21571657006115 is a wasteful number, since it uses less digits than its factorization.

21571657006115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22354048909.

The product of its (nonzero) digits is 441000, while the sum is 47.

The spelling of 21571657006115 in words is "twenty-one trillion, five hundred seventy-one billion, six hundred fifty-seven million, six thousand, one hundred fifteen".