21701515127 has 8 divisors (see below), whose sum is σ = 22372424592. Its totient is φ = 21037348800.

The previous prime is 21701515111. The next prime is 21701515141. The reversal of 21701515127 is 72151510712.

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 21701515127 - 2⁴ = 21701515111 is a prime.

It is a super-2 number, since 2×21701515127² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21701515093 and 21701515102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701515327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679249 + ... + 1692122.

It is an arithmetic number, because the mean of its divisors is an integer number (2796553074).

Almost surely, 2^21701515127 is an apocalyptic number.

21701515127 is a deficient number, since it is larger than the sum of its proper divisors (670909465).

21701515127 is a wasteful number, since it uses less digits than its factorization.

21701515127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371569.

The product of its (nonzero) digits is 4900, while the sum is 32.

The spelling of 21701515127 in words is "twenty-one billion, seven hundred one million, five hundred fifteen thousand, one hundred twenty-seven".