2181712187015 has 8 divisors (see below), whose sum is σ = 2618185496928. Its totient is φ = 1745282501280.

The previous prime is 2181712186939. The next prime is 2181712187023. The reversal of 2181712187015 is 5107812171812.

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

It is not a de Polignac number, because 2181712187015 - 2¹⁸ = 2181711924871 is a prime.

It is a super-2 number, since 2×2181712187015² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 10795916 + ... + 10996145.

It is an arithmetic number, because the mean of its divisors is an integer number (327273187116).

Almost surely, 2^{2181712187015} is an apocalyptic number.

2181712187015 is a deficient number, since it is larger than the sum of its proper divisors (436473309913).

2181712187015 is a wasteful number, since it uses less digits than its factorization.

2181712187015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21812089.

The product of its (nonzero) digits is 62720, while the sum is 44.

The spelling of 2181712187015 in words is "two trillion, one hundred eighty-one billion, seven hundred twelve million, one hundred eighty-seven thousand, fifteen".